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Mary McCosker, Trustee

Term: 9/2026
Appointing Authority: Contra Costa County Supervisor, District 2.

Resident of Lafayette since 1946. BA in History and Elementary Education credential from UC Berkeley. Taught at Donald Rheem Elementary School in Moraga for seven years. Served on the Lafayette School District Governing Board for 13 years. Currently on the boards of the Lafayette Historical Society, the Lafayette Improvement Association, and the YWCA Berkeley/Oakland. Married to Daryl McCosker for 40 years with three adult children and nine grandchildren.