DENTON, Texas (AP) _ Richard Dufallo, a conductor known for his energetic performances of contemporary music, has died at age 67.

Dufallo died Friday of stomach cancer.

Dufallo, who lived in Denton, conducted more than 80 major orchestras and festivals in the United States, Canada, and Europe, premiering numerous works by American and European composers, including Karlheinz Stockhausen, Jacob Druckman, Sir Peter Maxwell Davies and Krzystof Penderecki.

He was a former assistant conductor of the New York Philharmonic, and worked closely with Leonard Bernstein from 1965 to 1975. He also served as associate conductor of the Buffalo Philharmonic and as artistic director of contemporary music at the Aspen Festival in Colorado.

Survivors include his wife, pianist Pamela Mia Paul; two sons and a daughter.