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. Thomson was first elected to the assembly in 1996 and served three two-year terms. 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. She was elected to the Yolo County Board of Supervisors in 1986 and re-elected in 1990 and 1994. She won the seat in the California State Assembly in 1996, and served three terms. 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. Thomson retired from the Board of Supervisors in 2010, and was succeeded by Don Saylor.
