Teaching fellow, research assistant International Program in Taxation Harvard Law School, 1958-1961. Senior tax advisor Latin American Bureau, United States Agency for International Development, 1962-1965. With Office General Counsel, Agency for International Development, 1965-1966.
Legal adviser Agency for International Development, Brazil, 1966-1967, assistant director Brazil, 1967-1968. Director Office of Development Programs, Latin American Bureau, Agency for International Development, 1969-1972. Attorney, manager special projects Office General Counsel, General Electric Company, 1972-1974.
Private practice Washington, since 1974. Partner Heller & Rosenblatt, since 1991. Co-director special programs in Latin American University Illinois College Law, 1975—1980, co-director special programs in China, 1982—1986.
Board member Pan American Development Foundation, 1986—1998, president, 1998—2000. Co-founder Ukraine-United States Business Council, 1996, general counsel, since 1996. Co-founder Fund for Democracy and Development, 1993, senior vice president, 1993—2004.