Our maintainers are the lynchpins of the language tracks and exercises on Exercism. This group of wonderful people maintain the Haskell Track, creating and updating the exercises and tooling for Haskell.
I taught myself Haskell as a logical next step after having learned OCaml. Although I don't use it for my job, I find it an interesting language; I especially enjoy its type system. I'm mostly a "break glass in case of emergency" maintainer.
I've been a classroom teacher in compilers and various functional languages for five years. Having pure functions and isolation of side-effects are fundamental to separation of concerns. Strong, static types, type inference and algebraic types are hard for me to live without.