He graduated from Woodside High School (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 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.
Visit tinyurl.com/Koster-229 for more information and to leave remembrances on the Almanac's Lasting Memories website.
He requested donations to Bat Conservation International (batcon.org).
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