Lawyer, Ferroviaria de Seguro Social, 1967-1968. General Manager, Caja Ferroviaria de Seguro Social, 1969-1972. Lawyer, Instituto Boliviano de Seguridad Social, 1973-1978. Director Ejccutivo, Caja Nacional de Seguridad Social, 1979-1980. Publications: "Study of the Social Security Code," 1975. Professor, Social Security Law, Universidad Mayor de San Andrés, 1984-1996. Professor, Social Security and Labor Law, Universidad Católica Boliviana, 1993-2001.