Morton Subotnick

Morton Subotnick (born 1933) is one of the United States' premier composers of electronic music and an innovator in works involving instruments and other media, including interactive computer music systems. Most of his music calls for a computer part, or live electronic processing; his oeuvre utilizes many of the important technological breakthroughs in the history of the genre.

http://www.creatingmusic.com/subotnick/about.html
http://en.wikipedia.org/wiki/Morton_Subotnick