Past President Markham Regional Arboretum Society; Alamo R-7A Park and Recreation Committee (1984-1988) Chair 1987; San Ramon Valley Steering Committee of Diablo Valley Foundation for the Aging (1983-1988) Chair (1983-1986); Mt. Diablo Regional YMCA Board of Directors (1983-1992); Duke University Alumni of Northern California President 5 years; past President of: Danville Lions Club (1973), Danville Area Jaycees (1971) and Rotary Club of Alamo (1991-92). Past Chair San Ramon Valley Area Planning Committee; organizer and Secretary of Diablo Valley Savings & Loan; Past Chair Development Committee of the Mt. Diablo Interpretive Association; Past Moderator of First Congregational Church of Berkeley; Board of Governors East Bay Community Foundation (1973-1979); founder and former Chair San Ramon Valley Community Center and Danville Area Police Service Area; "Citizen of the Year" of San Ramon Valley 1973; "Citizen of the Year" of Alamo 1987. Contra Costa Republican Party Central Committee, Chair 2001-02 and Chair of Red, White & Blue Ball 1990; District Governor Rotary D-5160 2005-06. President International Fellowship of Scouting Rotarians 2009-12.
Past President of Mt. Diablo Council, BSA (1986-87); Scoutmaster of local and World Jamboree Scout troops; multiple other local, national and international Scouting leadership; recipient of Scouting awards including the Scouters' Key, District Award of Merit, Religious Award, Mt Diablo Council Silver Beaver, National Distinguished Eagle Scout, Baden Powell Fellow, Order of Condor; past Chair National BSA Community Relationships Comm.; BSA Relationships Committee
Admitted to California and various Federal Courts since 1967, the U. S. Supreme Court in 1982. Practice is primarily in the areas of real estate, family law and civil litigation but background included some criminal and broad civil. California Certified Family Law Specialist, "av" rated attorney in Martindale-Hubbel 25+ years. A.B. in Political Science from Duke University in 1960; graduate work at the State University of New York (Plattsburg) 1961 - 1963, Juris Doctor Hastings College of the Law in 1967.
UC Hastings College of the Law Alumnus of the Year -- 2000.
Numerous law related activities including past President of Board of Governors Hastings Alumni Association; Board of Trustees of Hastings Foundation; Past President (1974) Contra Costa County Bar Association; was Judge Pro Tem Danville-Walnut Creek, Bay, Delta and Mt. Diablo Municipal Courts; Arbitrator and Judge Pro Tem for Contra Costa County Superior Court; California State Bar Disciplinary Referee (1979 -1988); Adjunct Professor, John F. Kennedy University Law School (1977 - 1979); various bar associations.
Founded the Mt Diablo Courthouse Alternatives Program (D-CAP) providing private judging, arbitration and mediation programs since 1990.
United States Air Force (Strategic Air Command) Base Education and Training officer (1960-1963) - Captain - plus two years active Air Force Reserves. Mr. Thiessen lives with his wife Carolyn and proud father of three adult children – Robert, Erica and William!
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