sentences:  In 1974, he became an associate professor at the Hebrew University of Jerusalem.In 1976, he was promoted to professor of biochemistry at the Hebrew University of Jerusalem.He has been visiting scientist at the National Cancer Institute, and Fogarty International Scholar, NIH, Bethesda, Maryland, visiting scholar at Stanford University in California, visiting professor at the University of Oregon (Eugene) and visiting professor at the University of California, San Francisco.