Matthew Flatt is a professor at the University of Utah, and one of the main developers of PLT Scheme right now. I just finished his Programming Languages class

Matthew Flatt is a professor at the University of Utah, and one of the main developers of PLT Scheme right now. I just finished his Programming Languages class, which is taught in Scheme, and am currently in his Functional Programming class. I've really started to enjoy Scheme, and functional programming in general.