John Holsinger was a tennis player, coach, and official who was associated with the Hong Kong Tennis Association (HKTA) for most of his life. Holsinger began coaching with the HKTA in 1976, first working with a coaching clinic, before moving on to work with the national junior squad. In local tennis competitions he won back-to-back Hong Kong National Tennis Championships in 1980 and 1981 with his doubles partner Randall King. During the 1980s in Hong Kong Holsinger won three men’s doubles and six mixed doubles titles. As an official with the National Olympic Committee of Hong Kong he was the chair umpire for three singles matches at the 1988 Seoul Olympics. In 2005 he became the Asia-Pacific director of the Global Health and Fitness Association. Holsinger was also a member of the Sydney Harley Davidson chapter in Australia. He was killed in a motorcycle accident in February 2022 near Adelaide while he was on a trip with the motorcycle club.