Helen MacLeod Thomson is a former member of the Yolo County Board of Supervisors and a former Democratic assemblywoman from California's 8th Assembly district.
She was the first of what have become three consecutive women from Davis to be elected to this seat, followed by Lois Wolk and Mariko Yamada.
Helen Thomson was elected in 1974 to the Davis Joint Unified School District Board of Education.
In 2002, when her assembly term ended, Thomson again won a seat on the Yolo County Board of Supervisors, and was re-elected without opposition in June 2006.
She lives in Davis with her husband, Captane P. Thomson, M.D., a practicing psychiatrist, and former head of the California Psychiatric Association.