Program Manager, Program for the Control of Acute Respiratory Infections, World Health Organization since 1987. Chief, Tuberculosis & Respiratory Infections Unit, World Health Organization, Geneva, 1980-1987. Regional Advisor in Tuberculosis, Pan-American Health Organization, Washington, District of Columbia, 1971-1979.
Chief, Research Department, National Institute of Epidemiology, Ministry of Health & Social Welfare, March del Plata, Argentina, 1970-1971. Chief, Epidemiology Section, National Institute of Tuberculosis, Ministry of Health & Social Weifare, Santa Fe, Argentina, 1961-1969.