The Haskell Interlude

The Haskell Interlude is Haskell-focused podcast where we interview guests from the Haskell community. The hosts are Joachim Breitner, Andres Löh, Alejandro Serrano, Wouter Swierstra and Niki Vazou.

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.

9 – 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.

8 – 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. Together they discuss Théophile’s introduction to Haskell and their ongoing projects with the Foundation and the broader community, with a focus on the challenges facing Haskell non-experts and how they hope to tackle them.

7 – José Calderón

José Calderón is interviewed by Niki Vazou and Wouter Swierstra . José has been working on functional programming at Galois and University of Maryland. He tells us about his research background in many different continents, his experience with teaching compilers, the relation between music and functional programming and the “Recursive Programming Techniques” book that in the 1970s captured the essence of functional programming.

6 – Graham Hutton

Graham Hutton is interviewed by Wouter Swierstra and Andres Löh. Graham is known for his work on Haskell both in research and teaching Haskell, and in particular his Haskell book. Graham will tell us a little bit about how his book came about and give us advice for how to write a book ourselves, but also look back on his experience using Haskell and teaching Haskell in the last thirty years, and tell us a little bit about how bad the compile times were for the very first versions of GHC.

5 – Chris Smith

Chris Smith is interviewed by Joachim Breitner and Andres Löh. Chris is the author of the CodeWorld teaching tool and discusses why too much curry in the language can make error messages hard to digest and why a self respecting testing library certainly should be used to test itself.

4 – Jasper Van der Jeugt

Jasper Van der Jeugt is interviewed by Niki Vazou and Joachim Breitner. Jasper plays an important role in the Haskell community, helping with, the Google Summer of Code project, ZuriHac and the ICFP programming contest, so there is much to talk about.

3 – Gabriella Gonzalez

Gabriella Gonzalez is interviewed by Joachim Breitner and Alejandro Serrano, and we talk about Dhall, Nix, and Haskell, learn why Gabriella’s packages are sometimes called after characters of computer games, and get to know her elevator pitch for educating Haskell

The interviewee now goes by Gabriella as their preferred name, but at the time was still using Gabriel.

2 – Lennart Augustsson

The guest in our second episode is Lennart Augustsson. The hosts are Wouter Swierstra and Niki Vazou. We talk about Lennart’s long history with Haskell, about the various jobs he has had, all the compilers he has written, and about dependent types.

1 – Emily Pillmore

The guest of our first regular episode is Emily Pillmore, CTO of the Haskell Foundation. The hosts are Alejandro Serrano and Andres Löh. We talk about Emily’s path to Haskell, the role of the Haskell Foundation and the CTO within the Haskell Foundation, about current projects, the Haskell Community and about Emily’s work on Optics.

0 – Teaser

We are starting a new Haskell-focused podcast where we interview guests from the Haskell community. The hosts are Niki Vazou, Joachim Breitner, Andres Löh, Alejandro Serrano and Wouter Swierstra. In this teaser episode, we introduce ourselves.


The music used is "Blue Lambda" by Donya Quick.
Many thanks to Donya for giving us permission to use this track for our podcast.

We are very grateful to Alp Mestanogullari and Jose Calderon for their help with editing the episodes and to Krishna Padmasola, Ben Orchard, and Mihai Maruseac for their help with the transcription.

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