Functional programmer, PhD in computer science, and quantitative finance developer. I've been programming Haskell for 18 years. I write trading software for Standard Chartered Bank. Views expressed are my own.

Co-author of the book, Real World Haskell, and of the xmonad window manager. I founded the Haskell Platform project, co-invented the stream fusion optimization and wrote the bytestring and binary libraries for Haskell. I'm interested in building great software, type-driven compiler optimizations, type-driven software design and software optimization.