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I'm a Haskell programmer who lives in Cambridge with my wife Emily and son Henry. I have a PhD in Computer Science from York University, working on making functional programs shorter, faster and safer. Since then I've worked at Credit Suisse, Standard Chartered, Barclays Bank and Digital Asset, and I currently work at Facebook — but all content and opinions are my own. I'm a strong believer in the functional programming approach, finding the combination of conciseness, static-typing and testability to offer significant advantages. I've got a blog mostly about Haskell, and I'm also on Twitter, LinkedIn and GitHub. To get in touch email me at

Open Source Projects

I develop a number of open source Haskell projects, all of which can be found at my Github page or on Hackage. I welcome both contributions via pull requests and bug reports via the GitHub issue trackers. Some of my more popular projects include:

  • Shake - a library for writing build systems, an alternative to make.
  • Hoogle - a Haskell API search engine, searching the standard Haskell libraries by function name and type signature.
  • HLint - a tool that suggests stylistic improvements to Haskell code.

A list of all my talks and papers are available on


  1. hlint Public

    Haskell source code suggestions

    Haskell 1.3k 174

  2. ghcid Public

    Very low feature GHCi based IDE

    Haskell 1.1k 101

  3. shake Public

    Shake build system

    Haskell 718 117

  4. hoogle Public

    Haskell API search engine

    Haskell 651 120

1,013 contributions in the last year

Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Mon Wed Fri

Contribution activity

December 2022

Created 1 repository

Created a pull request in facebook/react-native that received 3 comments

Add support for Buck oncall annotations

Summary Newer versions of Buck (not released open source) support an oncall annotation to denote who owns a particular BUCK file. These annotations…

+9 −0 3 comments
Reviewed 1 pull request in 1 repository
facebook/react-native 1 pull request

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