de Groot, Marc. In Taos, N.M. Aug. 8. Age 45. Son of Barbara and Louis de Groot. Brother of David de Groot. Nephew and cousin to many. Born in Brooklyn, N.Y. Grew up in New York’s Dutchess and Rockland counties and in Paris. Settled in Bay Area in 1978. Pioneer in virtual reality modeling language. Founder of Immersive Systems Inc. Created Meme, a development system for virtual world software. Contributed technology that impacted disabled children. Volunteered mobile amateur radio station to San Francisco General Hospital after 1989 Loma Prieta earthquake. Services were held Rolling Hills Memorial Park in Richmond. Donations to Marc de Groot Mental Health Fund, c/o Oakland Jewish Philanthropical Foundation, 1850 Mount Diablo Blvd., Suite 370, Walnut Creek, CA 94596-4423.

Mathan, Gerda S. In Berkeley. Aug. 10. Age 83. Mother of Dan Barki, Margalit Mathan August, Dalia Mathan. Grandmother of Alon, Tal and Seona August. Sister of Vernon Stroud and Eva (and Henry) Linker. Aunt to many nieces and nephews. Born in Karlsruhe, Germany. Fleeing Hitler, family moved to Berkeley in 1939. Scholar in the sciences. Taught at various colleges. Married twice to Israeli citizens. Photographer. Works featured in many exhibitions and the book “Valentina’s Uncle.” Services were held on Aug. 13 at Home of Eternity in Oakland. Donations to Tehiyah Day School, 2603 Tassajara Ave., El Cerrito, CA 94530.

Minkin, Adrian Monroe. In Walnut Creek. Aug. 12. Age 57. Husband of Marlene Minkin. Father of Erika and Ashley Minkin. Grandfather of Connor Minkin. Brother of Lynne (and Mark) Snyder, Rhea (and Elliot) Adler and Sheryl Minkin. Uncle of Mahala, Matt and Jalen Archer; Garrett Snyder; and Arriel and Logan Adler. Arrangements by Sinai Memorial Chapel. Donations to Congregation Beth Emek, 1886 College Ave., Livermore, CA 94550, or American Cancer Society, 201 Mission St. #720, S.F., CA 94105.