About Rudi Koertzen
Rudolf Eric Koertzen was a South African international cricket umpire and former cricketer. A cricket enthusiast since his youth, he played league cricket while working as a clerk for South African Railways. He began umpiring in 1981, before becoming a full-time official eleven years later. In an international career spanning 18 years, he officiated in a record 331 matches and is only behind Aleem Dar in officiating as an umpire in most international matches. Koertzen officiated in his first One Day International (ODI) on 9 December 1992, and in his first Test match later the same month. Koertzen soon became well known for his manner of giving batters out.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.