With Philipps Brothers, New York City, 1954—1964, Phibro office manager Madrid, 1964—1974. Co-founder Marc Rich + Co AG (name changed to Glencore International, 1994), Zug, Switzerland, 1974—1997, Marc Rich + Co Holding AG, Zug, Switzerland, 1987.
Co-founder Rich Foundations. Chairman Marc Rich Foundation Education, Culture & Welfare, Gabrielle Rich Foundation Leukemia Research, Swiss Foundation for the Doron Prize.
Married Denise Eisenberg, October 1966 (divorced 1992). Children: Ilona, Gabrielle(deceased), Danielle.