 He joined the faculty of the University of California, Los Angeles (UCLA) two years later as an associate professor, and became a full professor in 1966.Orbach's research in theoretical and experimental physics has resulted in the publication of more than 240 scientific articles, and he is a fellow of the American Physical Society and the American Association for the Advancement of Science.From 1982 to 1992, he served as the Provost of the College of Letters and Science at UCLA, and from 1992 to 2002 as Chancellor of the University of California, Riverside.