Co-President of IPPNW, the International Physicians for the Prevention of Nuclear War (Nobel Peace Prize in 1985) and member of the International Steering Group of ICAN, the International Campaign to Abolish Nuclear Weapons (Nobel Peace Prize in 2017). He is a general practitioner, former director of health at the Costa Rican Ministry of Health and former official of the Costa Rican Social Security Fund (CCSS), where he worked in primary care and as a resident in gynaecology and obstetrics.