It's always good to dig into musical roots from time to time, & find someone inspiring to discover. Ussachevsky was a pioneer of electronic music. Here's what Wikipedia says:
In 1947, following a stint with the U.S. Army Intelligence division in World War II, he joined the faculty of Columbia University, teaching there until his retirement in 1980. Together with Otto Luening, Ussachevsky founded, in 1959, the Columbia-Princeton Electronic Music Center in New York City. While acting as head of the Electronic Music Center Ussachevsky specified the ADSR envelope in 1965, a basic component of modern synthesizers, samplers and electronic instruments.
And his music is great! Enjoy!