Marvin Rosen is an American pianist, music educator, musicologist and host of the weekly radio program 'Classical Discoveries', which airs on WPRB 103.3 FM - Princeton, NJ. He is best known for his work in promoting the music of living composers as well as the music of Alan Hovhaness. Wikipedia*
On the C-SPAN Networks:
Marvin Rosen has one video in the C-SPAN Video Library; the first appearance was a 1996 Convention.