The Haskell Interlude
The Haskell Interlude is a podcast about the Haskell programming language and its community. Five co-hosts — Wouter Swierstra, Andres Löh, Alejandro Serrano, Niki Vazou and Joachim Breitner — take turns chatting with guests from the Haskell world. Episodes cover functional programming topics, research, tooling, and the practical experiences of people who write Haskell. The tone is conversational, aimed at listeners who are already curious about or working with the language.
Episodes
87: Edward Kmett
For the new Haskell Interlude, we sat down with Edward Kmett. Ed is the Founder and Chief Scientist of Positron AI. More importantly, he's a legend in the Haskell community for authoring many, many popular Haskell packages, first and foremost lens - and generally turning up the abstraction level to 11. We talk about design principles for Haskell libraries, category theory, cache-oblivious alg
86: Michael Hanus
In this episode, we sat down with Michael Hanus. Michael is a professor at the University of Kiel and is one of the founders of functional logic programming, the combination of logic and functional programming in a single formalism. Michael is also the creator of Curry, a functional-logic language that resembles Haskell, so you can dive right in if you're familiar with Haskell. Naturally, we
85: Brent Yorgey
In today’s episode, we’re joined by Brent Yorgey, Associate Professor of Computer Science at Hendrix College and the creator, among other things, of the Diagrams vector graphics library and Swarm, a 2D programming and resource gathering game. We talk about teaching, domain specific languages, and competitive coding.Episode links and transcript
84: Sylvain Henry
In this episode of the Haskell Interlude, we are joined by Sylvain Henry, one of the all-time top contributors to GHC. He tells us about his work on GHC, the bignum library, modularization, and the secret to becoming a top contributor!
83: POPL 2026 - Part 2
This is the first part of a miniseries on this year’s Symposium on Principles of Programming Languages, a.k.a. POPL 2026, hosted by Jessica Foster.In this episode we talk about: symbolic execution monads, what a lazy linear core in Haskell might have in common with Rust, hyperfunctions, the hallway track, and how to deal with rejection.
82: Fraser Tweedale
We talked to Fraser Tweedale. Fraser works at Red Hat, and is on the Haskell Security Response Team. We talked about security in the context of Haskell, both technical and organizational issues, and also the political issues involved. Fraser's work is both really important and not well-known in the Haskell ecosystem, so it was high time for him to come on the show.
81: Torsten Grust
Mike and Andres sat down with Torsten Grust, who is a professor of DB systems at the University of Tübingen. Even though Torsten loves SQL, he's used functional programming and Haskell to inform his work on query language design and compilation. We talked about the best way to program databases, how to bridge the gap between regular programming languages and databases, and compiling just abou
80: POPL 2026 - Part 1
This is the first part of a miniseries on this year’s Symposium on Principles of Programming Languages, a.k.a. POPL 2026, hosted by Jessica Foster.In this episode, we talk about: undergrad funding and participation, the behind the scenes of AV, choreographic programming, quantum languages, conference catering, and the joy of theory. And at one point, you’ll even hear us get kicked out the venue mi
79: Peter Thiemann
Peter is a professor at the University of Freiburg, and he was doing functional programming right when Haskell got started. So naturally we asked him about the early days of Haskell, and how from the start Peter pushed the envelope on what you could do with the type system and specifically with the type classes, from early web programming to program generation to session types. Come with us on a t
78: Jamie Willis
In this episode, we focus on a particular part of Haskell: teaching it. To help us, we are joined by Jamie Willis who is a Teaching Fellow at Imperial College London. The episode explores the benefits of live coding, and why Haskell is the best language for teaching programming.
77: Franz Thoma
Franz Thoma is Principal Consultant at TNG Technology Consulting, and an organizer of MuniHac. Franz sees functional programming and Haskell as a tool for thinking about software, even if the project is not written in Haskell. We had a far-reaching conversation about the differences between functional and object-oriented programming and their languages, software architecture, and Haskell adoption
76: Jeffrey Young
Welcome to the Haskell Interlude. Today, Matti and Mike talk toJeffrey Young. Jeff has had a long history of working with Haskell andon ghc itself. We talk about what makes Haskell so compelling, thegood and bad of highly optimized code and the beauty ofwell-modularized code, how to get into compiler development, and howto benefit from Domain-Driven Design.Jeff is currently on the job market - if
75: Kathrin Stark
We are joined by Kathrin Stark, a professor at Heriot-Watt University in Edinburgh. Kathrin works on program verification with proof assistants, so her focus is not exactly on Haskell, but on topics dear to Haskellers' hearts such as interactive theorem provers, writing correct programs, and the activities needed to produce them. We discuss many aspects of proofs and specifications, and the l
74: Lennart Augustsson
This episode is a deep dive into the evolution of Haskell and functional programming with one of its pioneers, Lennart Augustson. It reflects on decades of work in language design and compiler implementation. Lennart speaks about his early involvement in the creation of Haskell, shares thoughts on type systems, performance, and the balance between purity and practicality. The conversation ranges
73: Jean-Philippe Bernardy
In this Interlude, we’re joined by Jean-Philipe Bernardy, a Senior Lecturer at University of Gothenburg and Chalmers University of Technology. We discuss letting types be your guide, getting into AI to feed yourself, and never testing your programs.
72: Manuel Chakravarty
In this episode, we talk to Manuel Chakravarty - specifically, his work on the ghc backend such as data-parallel Haskell and the FFI and how that work segued into type system design. We also discussed Manuel's perspective on Haskell from the language design of Swift.
71: Stefan Wehr
Stefan Wehr is a professor at the Offenburg University of Applied Sciences. Before becoming a professor, Stefan worked in industry on a large Haskell codebase - specifically one that's not a compiler and not a blockchain. So of course we talked about using Haskell in large projects, software architecture, modularity, type classes and data modeling and the suppression of sums outside of functi
70: Phil Wadler
We sat down with Phil Wadler, one of the most influential folks in the Haskell community, functional programming, and programming languages, responsible for type classes, monads, and much more. We take a stroll down memory lane, starting from Haskell's inception. We talked about the difference between research and Phil's work on impactful industrial projects and standards - specifically
69: Jurriaan Hage
Today’s guest is Jurriaan Hage. Jurriaan is a professor at Heriot-Watt University in Edinburgh who’s worked with and on Haskell for many years. He’s known for the Helium Haskell compiler, specifically designed for teaching, and he has plenty of other projects related to Haskell, including improvements to the type system, the generation of better error messages, or detection of plagiarism.
68: Michael Snoyman
In this episode, we’re joined by Michael Snoyman, author of Yesod, Conduit, Stackage and many other popular Haskell libraries.We discuss newcomer friendliness, being a Rustacean vs a Haskellasaur, how STM is Haskell’s best feature and how laziness can be a vice.
67: Alex McLean
Mike and Andres speak to Alex McLean who created the TidalCycles system for electronic music - implemented in Haskell of course. We talk about how Alex got into Haskell coming from Perl, how types helped him think about the structure of music and patterns, the architecture and evolution of TidalCycles, about art, community and making space for new ideas, and lots of things in between.
66: Daniele Micciancio
Niki and Mike talked to Daniele Micciancio who is a professor at UC San Diego. He's been using Haskell for 20 years, and works in lattice cryptography. We talked to him about how he got into Haskell, using Haskell for teaching theoretical computer science and of course for his research and the role type systems and comonads could play in the design of cryptographic algorithms. Along the way,
65: Andy Gordon
Andy Gordon from Cogna is interviewed by Sam and Matti. We learn about Andy’s influential work including the origins of the bind symbol in haskell, and the introduction of lambdas in Excel. We go onto discuss his current work at Cogna on using AI to allow non-programmers to write apps using natural language. We delve deeper into the ethics of AI and consider the most likely AI apocalypse.
64: Sandy Maguire
In this episode Mike Sperber and Niki Vazou talk with Sandy Maguire, lead compiler engineer at Manifold Valley. They talk about the benefits of using Haskell of course, about all the books Sandy has written, on effects and the problem with monads, on combinator libraries and programming with laws.
63: Farhad Mehta
On this episode of the Haskell Interlude, Andres Löh and Mike Sperber are joined by Farhad Mehta, a professor at OST Rapperswil, and one of the organizers of ZuriHac. Fahrad tells us about formal methods, building tunnels, the importance of education, and the complicated relationship between academia and industry.
62: Conal Elliott
In this episode Wouter Swiestra and Niki Vazou talk with Conal Elliott. Conal discusses doing things just for the poetry, how most programs miss their purpose, and the simplest way to ask a question. Conal is currently working on a book about his ideas and actively looking for partners.
61: Sam Lindley
Sam Lindley is a Reader in Programming Languages Design and Implementation at the University of Edinburgh. In this episode, he tells us how difficult naming is, the different kinds of effect systems and handlers, languages *much* purer than Haskell, and Modal logic.
60: Tom Ellis
Tom Ellis works at Groq, using Haskell to compile AI models to specialized hardware. In this episode, we talk about stability of both GHC and Haskell libraries, effects, and strictness, and the premise of functional programming: make invalid states and invalid *laziness* unrepresentable!
59: Harry Goldstein
Sam and Wouter interview Harry Goldstein, a researcher in property-based testing who works in PL, SE, and HCI. In this episode, we reflect on random generators, the find-a-friend model, interdisciplinary research, and how to have impact beyond your own research community.
58: ICFP 2024
In this episode, Matti and Sam traveled to the International Conference on Functional Programming (ICFP 2024) in Milan, Italy, and recorded snippets with various participants, including keynote speakers, Haskell legends, and organizers.
57: Gabriele Keller
Gabriele Keller, professor at Utrecht University, is interviewed by Andres and Joachim. We follow her journey through the world as well as programming languages, learn why Haskell is the best environment for embedding languages and how the desire to implement parallel programming sparked the development of type families in Haskell and that teaching functional programming works better with graphics
56: Satnam Singh
Today on the Haskell Interlude, Matti and Sam are joined by Satnam Singh. Satnam has been a lecturer at Glasgow, and Software Engineer at Google, Meta, and now Groq. He talks about convincing people to use Haskell, laying out circuits and why community matters.PS: After the recording, it was important to Satnam to clarify that his advise to “not be afraid to loose your job” was specially meant to
55: Sebastian Ullrich
In this episode, Niki and Andres talk with Sebastian, one of the main developers of Lean, currently working at the Lean Focused Research Organization. Today we talk about the addictive notion of theorem provers, what is a sweet spot between dependent types and simple programming and how Lean is both a theorem prover and an efficient general purpose programming language.
54: Dominic Orchard
In this episode, Wouter and Sam interview Dominic Orchard. Dominic has many roles, including: senior lecturer at the University of Kent, co-director of the Institute of Computing for Climate Science, and bye-fellow of Queen’s College in Cambridge. We will not only discuss his work on Granule - graded monads, coeffects, and linear types - but also his collaboration with actual scientists to improve
53: Garrett Morris
In this episode, Garrett Morris talks with Wouter Swierstra and Niki Vazou about his work on Haskell’s type classes, how to fail successfully, and how to construct a set of ponies.
52: Pepe Iborra
Andres and Sam interview Pepe Iborra, exploring his journey from academia via banking to now Meta. In this episode, we discuss Pepe’s involvement in the evolution of the Haskell ecosystem, in particular the ongoing journey to improve the developer experience via work on debuggers, build systems and IDEs.
51: Victor Cacciari Miraldo
Victor Miraldo is interviewed by Niki and Joachim and walks us through this career from a student falling in love with List.foldr through a PhD student using agda to verify cryptographic data structures and generic diff and merge algorithms to a professional developer using Haskell in production. He’ll tell us why the Haskell community is too smart, why there should be a safePerformIO, and that he
50: Tom Sydney Kerckove
In this episode Tom Sydney is chatting with Matti Paul and Niki Vazou. Tom is the author of many tools, like sydtest, decking, and nix-ci. He tells us about the rules for sustainable Haskell, how Haskell lets one man do the job of 50, and the secret sauce for open source.Tom Sydney is also looking for work these days, so get in touch!
49: Arseniy Seroka
Wouter and Joachim interview Arseny Seroka, CEO of Serokell. Arseny got into Haskell because of a bet over Pizza, fell for it because it means fewer steps between his soul and his work, and founded Serokell because he could not get a Haskell job. He speaks about the business side of a Haskell company, about the need for more sales and marketing for Haskell itself, and about the Haskell Developer C
48: José Nuno Oliveira
In this episode, Andres Löh and Matthías Páll Gissurarson interview José Nuno Oliveira, who has been teaching Haskell for 30 years. José talks about how Haskell is the perfect language to introduce programming to all sorts of audiences, why it is important to start with Haskell, and how the programmers of the future have been learning Haskell for several years already!
47: Avi Press
Avi Press is interviewed by Joachim Breitner and Andres Löh. Avi is the founder of Scarf, which uses Haskell to analyze how open source software is used. We’ll hear about the kind of shitstorm telemetry can cause, when correctness matters less than fearless refactoring and how that can lead to statically typed Stockholm syndrome.
46: effectfully
Roman, known better online as effectfully, is interviewed by Wouter and Joachim. On his path to becoming a Plutus language developer at IOG, he learned English to read Software Foundations, has encountered many spaceleaks, and used Haskell to prevent robots from killing people.
45: András Kovács
In this episode, András Kovács is being interviewed by Andres Löh and Matthias Pall Gissurarson. We learn how to go from economics to functional programming, how GHC's runtime system is superior to Rust's, the importance of looking at GHC's Core for spotting stray closures, and why staging might be the answer to all your optimisation problems.
44: José Manuel Calderón Trilla
Wouter and Niki interview Jose Calderon, the new Executive Director of the Haskell Foundation. Jose tells why he applied for the job, how he sees the foundation developing over the coming years, and how you can get involved in the Haskell community.
43: Ivan Perez
In this episode, Wouter and Andres interview Ivan Perez, a senior research scientist at NASA. Ivan tells us about how NASA uses Haskell to develop the Copilot embedded domain specific language for runtime verification, together with some of the obstacles he encounters getting to end users to learn Haskell and adopt such an EDSL.
42 : Jezen Thomas
Jezen Thomas is co-founder and CTO of Supercede, a company applying Haskell in the reinsurance industry. In this episode, Jezen, Wouter and Joachim talk about his experience using Haskell in industry, growing a diverse and remote team of developers, and starting a company to create your own Haskell job.
41: Moritz Angermann
Today, Matthías and Joachim are interviewing Moritz Angermann. Moritz knew he wanted to use Haskell before he knew Haskell, fixed cross-compilation as his first GHC contribution. We’ll talk more about cross-compilation to Windows and mobile platforms, why Template Haskell is the cause of most headaches, why you should be careful if your sister calls and tells you to cabal install a package, and fi
40: Mike Sperber
In this episode, Andres and Matti talk to Mike Sperber, CEO of Active Group in Germany. They discuss how to successfully develop an application based on deep learning in Haskell, contrast learning by example with the German bureaucratic approach, and highlight the virtues of having fewer changes in the language.
39: Rebecca Skinner
In this episode, we are joined by Rebecca Skinner. She talks about her new book, Effective Haskell, which takes you from list manipulation to thunks to type-level programming. She also tells us about large scale industrial applications in Haskell, and how the architecture is shaped by the organization of the engineering teams.Disclaimer: Mercury is a financial technology company, not a bank. Banki
38: Edwin Brady
Andres and Wouter interview Edwin Brady, most famous for his work on the Idris programming language. We talk about how he got interested in programming with dependent types, his thoughts on dependently typed programming in Haskell, and his vision for Idris.
37: John MacFarlane
Joachim Breitner and David Thrane Christiansen interview John MacFarlane, a professor of philosophy at UC Berkeley, but also the author of the popular pandoc document conversion tool, which has been around half as long as Haskell itself.He also explains the principle of uniformity as a design goal for lightweight markup languages, the relationship between philosophy and programming, and along the
36: John Hughes
In this episode, Matti and Wouter are joined by John Hughes. John is one of the authors of the original Haskell Report and talks about why functional programming matters, the origins of QuickCheck testing, and how higher order functions and lazy evaluation is the key that makes functional programming so productive, and so much fun!
35: Iavor Diatchki
Wouter and Niki are joined by Iavor Diatchki to talk about his experience with different Haskell development styles, writing a high assurance wiki in php, and maintaining Haskell code across different GHC releases over multiple decades.
34: Lindsey Kuper
In this episode Niki Vazou and Wouter Swierstra chat with Lindsey Kuper, Assistant Professor at University of California, Santa Cruz. They discuss what to do when your data center gets hit by a tornado, life in academia versus life in industry, and what is choreographic programming.
33: David Christiansen
In this farewell interview with David Thrane Christiansen, the outgoing Executive Director of the Haskell Foundation, hosts Wouter Swierstra and Matthías Páll Gissurarson use the opportunity to reflect on his tenure as ED, the recent history of the Haskell Foundation, where the HF is going and what consider if you want to apply for the role of Executive Director of the HF.
32: Ranjit Jhala
This episode’s guest is Ranjit Jhala. We discuss how Ranjit developed Liquid Haskell as a litmus test, because if Haskell programmer’s won’t use Liquid Types, no one will. We also hear how writing Haskell is a joy and how you should never underestimate your students.
31: Arnaud Spiwack
Arnaud Spiwack is interviewed by Matthías Páll Gissurarson and Joachim Breitner. We learn all about linear types in Haskell, how linear types go beyond Rust’s ownership system and why it’s not always best to type check everything in core. We conclude with a peek into the many activities of Arnaud’s employer, Tweag.
30: Bartosz Milewski
In this episode, Bartosz Milewski is interviewed by Wouter Swierstra and Andres Löh. Bartosz shares his thoughts on the "fringe topics" in programming, from C++ templates to category theory in Haskell. How he considers monads to be like fingers sticking out of the water. And he'll talk a little bit about his upcoming book and his thoughts on linear types.
29: ZuriHac
Joachim Breitner went to ZuriHac 2023 in order to bring the spirit of the biggest Haskell community event to you. He talks to Farhad Mehta, Tomáš Janoušek, Christian Georgii, David Christiansen, Artin Ghasivand, Hannes Siebenhandl, Michael Peyton Jones and Ben Lynn.
28: Richard Eisenberg
In this episode Niki Vazou and Mattias Pall chat with Richard Eisenberg. Richard is currently a language designer at Jane Street, he is the chair of the board at the Haskell Foundation and known for his work on the GHC compiler. Today we talk about dependent types in Haskell, how to get involved with GHC and Haskell foundation and how Haskell and Ocaml are different, for example, functor means a
27: Christiaan Baaij
In this episode Christiaan Baaij is interviewed by Wouter Swierstra and Mattias Páll. Christiaan talks about his work on the Clash compiler, what it is like to found your own company, his desire for ergonomic dependent types, and the foundations to all his success, namely capitalising on luck.Errata: Around the 21m19s mark Christiaan talks about “his“ contributions to GHC with regards to dynamic l
26: Simon Marlow
In this episode Simon Marlow talks with Andres Löh and Matthias Pall. Simon is a long time GHC contributor, currently working at Meta. He talks about compiling functional languages via C and the Evil Mangler, the importance of using parallelism and its impact on garbage collection, and about using Haskell in the real world via Sigma, Haxl, and Glean.
25: Bodigrim
In this episode Joachim Breitner and Wouter Swierstra talk to Andrew Lelechenko, also known as Bodigrim. Bodigrim went from a being a mathematician to a failed PHP developer the chair of the Core Libraries Committee. In this episode, we discuss whether he prefers number theory or Haskell, whether he prefers working with compilers or PHP frameworks, and whether he prefers high salaries for Haskell
24: Jeremy Gibbons
In this episode Andres Löh and Niki Vazou chat with Jeremy Gibbons. Jeremy Gibbons is professor at Oxford and talks about his journey from Orwell to Haskell, how to teach Haskell and specification languages to undergraduates as well as professional programmers, how programming languages should keep simple things simple, and how paper writing can or even should be like poetry.
23: Ben Gamari
In this episode Wouter Swierstra and Joachim Breitner chat with Ben Gamari. Ben is a consultant at well-typed known for his work at GHC. Ben tells us a little bit about his switch from Python to Haskell but not because he was missing the static typing, how programming his thermostat lead him to a career in the compiler development, and what it's like to be a GHC force multiplier.
22: Alejandro Russo
In this episode Andres Löh and Niki Vazou talk with Alejandro Russo. Alejandro is a professor at Chalmers University in Gothenburg Sweden, he is an enthusiastic functional programmer as well as a researcher in the fields of security and privacy. He talks about the unique strengths Haskell has in these areas and how to move research ideas into industry.
21: Andrey Mokhov
In this episode Matthías Páll and Andres Löh talk with Andrey Mokhov. Andrey is best known for his work on the Hadrian build system and today he talks about algebraic graphs, selective functors, and the difference between OCaml and Haskell.
20: Jesper Cockx
In this episode Jesper Cockx, one of the main Agda developers, is interviews by Niki Vazou and Matthias Pall. They talk about how to explain dependent types to one's father, how Agda’s automation and proof search work, and how Agda can be used to verify Haskell code bases.
19: Marc Scholten
In this episode Marc Scholten is interviewed by Andres Löh and Joachim Breitner. They talk about the Integrated Haskell Platform web framework (IHP), implicit parameters and nix.
18: Matthias Pall Gissurarson & Jimmy Koppel
In this episode Matthias Pall Gissurarson & Jimmy Koppel are interviewed by Wouter Swierstra and Niki Vazou. They talk about program synthesis, typed holes, program repair, and generating properties using a new technique called ECTAs.
17: Ningning Xie
Ningning Xie is interviewed by Niki Vazou and Andres Loh. Ningning first contributed to GHC at her Google summer of code project with a very ambitious goal of implementing the whole dependent Haskell. Also later she fixed several ghc bugs and worked on Koka’s Algebraic effects. Her future hope and advice is to use programming language concepts on real-word problems.
16: Oskar Wickström
Oskar Wickström is interviewed by Wouter Swierstra and Alejandro Serrano, he will tell us a little bit about property-based testing (PBT) Haskell code but also applying these ideas to the testing of complete systems. He will say a little bit about interfacing Haskell to other languages and even with your web browser and what it's like to learn Rust as a Haskell programmer.
15: Facundo Dominguez
Facundo Dominguez is interviewed by Niki Vazou and Joachim Breitner. Facundo Dominguez tells us the difference between STM and SMT. We also talk about Liquid Haskell and its relation to dependent types and the `QualifiedDo` extension -- which is one of the most highly discussed GHC proposals -- and the general GHC proposals. And, finally, Facundo lets have Haskell peacefully coexist with other lan
14: Ryan Trinkle
Ryan Trinkle is interviewed by Joachim Breitner and Niki Vazou. Ryan Trinkle has co-founded Obsidian Systems, a company that not just uses Haskell but even more exotic tech that as Functional Reactive Programming (FRP) and Nix. Ryan shed some light on the business side of Haskell and we get to hear that hiring for Haskell is actually excellent.
13: David Christiansen
David Christiansen is interviewed by Alejandro Serrano and Wouter Swierstra. They talk about many functional programming things, from Idris to Racket and of course Haskell and David's new role as the executive director of Haskell Foundation.
12: Gergő Érdi
Gergő Érdi is interviewed by Wouter Swierstra and Andres Löh. Gergő has an interesting path into Haskell taking many twists and turns. This episode discusses about these twists and Gergő's recent book on implementing retro computers using Haskell.
11: Simon Peyton Jones
Simon Peyton Jones is interviewed by Andres Löh and Joachim Breitner. Simon is the creator of Haskell and in this episode he talks about his new position at Epic, the origins of Haskell and why "it feels right", and the (extra)ordinary Haskell programmers.
10: Nadia Polikarpova
Nadia Polikarpova is interviewed by Alejandro Serrano and Niki Vazou. Nadia is an assistant professor at UCSD, where she works on improving how we write programs. They talk about some of her projects, like Hoogle+ and Synquid, and how she approaches teaching about these topics.
09: Sebastian Graf
Sebastian Graf is interviewed by Joachim Breitner and Alejandro Serrano. Sebastian is one of the most active contributors to GHC, and tells of this experience, from his very first commit to GHC to his current work on the pattern coverage checker and demand analyzer. He also gives us hints on how to reason about the strictness of Haskell programs.
08: Théophile Choutri
Niki Vazou and Andres Löh are joined by guest Théophile Choutri (they/them), who also goes by Hécate. Théophile coordinates multiple projects and volunteer groups within the Haskell Foundation, notably the Haskell School project (intending to provide a free online open source library for teaching Haskell), and works on improving GHC core documentation and developing an alternative to Hackage. Toge
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