Author: "Constitutional Comparative Study Between Chilean and Puerto Rican Labour Law." Counsel Positions: Legal Department of the Pacific Bank 1958-1962, Legal Counsel of the National Mining Service 1960-1962, Chief Counsel of the Chilean Geological Survey Institute 1962-1976, Legal Counsel of United Nations Program on Mining Development in Chile 1964-1970. Of Counsel, Chevron Resources Inc., 1983-1988. General Counsel, National Mining Society (SONAMI), 1974—. Chilean Legal Counsel, European Southern Observatory (ESO), 1963—. Chilean Representative, Carnegie Institution of Washington, 1971-1986. Chilean Representative, University of Toronto, 1975—. Advisor Bureau of Legal Affairs of People's Republic of China. Co-Drafter, Mining Code, 1980-1983. Other Positions: General Manager of Compañía Minera Loiea 1966, Legislative Mining Commissions 1960-1973, First Legislative Commission 1978-1980. Consulting Member, First Legislative Commission, 1980-1990.