(1948?-) Co-founder, along with Scott Wedge, of E-mu Systems. Rossum grew up in the San Francisco Bay area in the USA, and attended college at the California Institute of Technology, graduating in 1970 with a degree in biology. During that time, he was asked to help set up a Moog modular synthesizer, which got him interested in electronic music. After graduating, he went to the University of California - Santa Cruz for graduate school. While there, he met up with Wedge, whom he had known from high school, and they formed E-mu Systems in 1972.