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  • Arctic Code Vault Contributor

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. Haskell source code suggestions

    Haskell 1k 133

  2. Very low feature GHCi based IDE

    Haskell 888 89

  3. Shake build system

    Haskell 638 108

  4. Haskell API search engine

    Haskell 490 106

2,110 contributions in the last year

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

Contribution activity

September 2020

Created an issue in mpickering/hie-bios that received 5 comments

Consider a different name for the hie.yaml file

The current hie.yaml is an abbreviation for Haskell IDE Engine. That's meaningless to most people, and no longer represents the IDE we recommend. A…


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