Robert (Bob) Trimingham was born in Pleasanton in 1937. He attended Amador High School and went to Stanford University where he received a degree in Geology. He then received a degree in Physical Science/Education from UC Berkeley in 1963, and attended the University of Rochester in NY for a Master's Degree in Education.

Bob had a teaching career in Geology, Physics, and Math at Livermore High School which lasted for 30 years before his retirement in 1995.

Bob remained a loyal Stanford sports fan his entire life. His other primary interest was minerals and collecting mineral species, from micros to large showy specimens. He was a courageous mineral field tripper who avidly traveled America for collections, mineral shows and museums. He was a member of the Livermore Valley Lithophiles Gem and Mineral Society for 45 years. He helped with Lithorama Gem and Mineral shows, societies' booths, lithophiles’ presentations, and the San Leandro Library reading programs. He was a charter member of the Bay Area Mineralogists in Menlo Park, and belonged to the Northern California Mineralogical Association. Bob also was a member of the Museum on Main Street in Pleasanton, where he did displays on the Geology of the Tri-Valley area.

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