Nyman is an eminent figure on the contemporary scene. Working in a style you could call cerebral post-minimalism, known for his film scores (notably for the late Peter Greenaway), he's smart, hip ...
The late? Eek! But I suspect Midgette didn't check her Google results closely enough. There was an author named Peter Van Greenaway who died in 1988; he also wrote a few film screenplays, so it would be possible to get them confused. Van Greenaway was no relation (as far as I know) to the film director.
(A recent article in a "forgotten authors" series assessed Van Greenaway's work and made it sound like an interesting diversion, if not great literature.)