John Henry Geppert III, known as Jack, was last seen on December 10, 1988, in Los Angeles, California.

At disappearance he was described as between 5 feet 8 inches and 6 feet tall, 160 to 180 pounds, with light brown hair and brown eyes. Distinguishing marks include a small hernia scar in the groin and a previously fractured collarbone. The Huntington Beach Police Department classifies his case as endangered missing and continues to list it as open after extensive searches yielded no trace.

If anyone knew Jack Geppert, where he lived or worked in the late 1980s, or has any information that could help, please contact the Huntington Beach Police Department.