Tompson was instrumental in developing Breastfeeding Seminars for Physicians hosted regularly by La Leche League and held annually since 1973. She has served on many boards, committees and advisory councils, including the International Advisory Council for the World Alliance for Breastfeeding Action (1996 to present).; the Advisory Board for the National Association of Post Partum Care Services (1995), the Advisory Committee for Perinatal Health, Department of Public Health for the State of Illinois (1983); and served as a consultant for the WHO/UNICEF meeting on Infant and Young Child Feeding in Geneva, Switzerland in 1980.