Born and raised in Woodside, Mr. Koster died Jan. 24 at his home in Rancho Mirage with family and friends at his side. A former Los Altos resident, he had recently been diagnosed with cancer.
He graduated from Woodside High School in 1973 and Humboldt State University. After earning his registered nurse certification, he spent 20 years as a surgical nurse at Stanford University Hospital.
Mr. Koster was a published author, artist in and poet, the family said. In 2006, he moved to Rancho Mirage, where he established "Pandemonium," an artists' colony and workshop. In addition to his paintings, he had a large body of work in furniture and boxes that incorporated jewelry, semi-precious stones and found objects, family members said.
A consummate prankster, Mr. Koster was known for his wit and humor, the family said.
He is survived by his mother, Ruth Koster; father, Dr. Ronald Koster; stepmother Carol Stephens Koster; former partner Larry Wells; brothers John and David Koster; sisters Dr. Virginia Freckelton and Kimberly Evans; and several nieces and nephews.
He requested memorial donations be made to Bat Conservations International (batcon.org).
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