After completing his studies, Oshman worked for several years as an engineer at
Philco Corporation, an American company that specialized in electronics and defense systems. In 1969, he co-founded
ROLM Corporation with three of his former classmates from Rice University — Gene Richeson, Walter Loewenstern, and
Robert Maxfield.{{cite web|accessdate=March 5, 2025 In 1984, ROLM was acquired by
IBM for $1.8 billion. After leaving ROLM, in 1988, Oshman became the CEO of
Echelon Corporation, a company that specialized in creating energy-efficient technologies for homes and buildings. Under his leadership, Echelon became involved with the
smart grid industry, developing technologies that helped to improve the efficiency and reliability of energy systems. == Philanthropy and community involvement ==