Jon Harrop was a cofounder ofcofounded [http://www.ffconsultancy.com Flying Frog Consultancy] and wrote the books [http://www.ffconsultancy.com/products/ocaml_for_scientists/ OCaml for Scientists] and [http://www.ffconsultancy.com/products/fsharp_for_technical_computing/ Visual F# 2010 for Technical Computing].