With his deep knowledge of the sport, Hersh has been the English language stadium announcer at many high-profile meets including the 1984 Summer Olympics through the 1996 Summer Olympics and also the 2004 and 2008 Summer Olympics, the IAAF World Championships in Athletics from 1991 to 2007, the IAAF World Cup in 1994, 1998 and 2006, the IAAF World Indoor Championships in Athletics in 1987, 1999 and 2008, and the IAAF World Junior Championships in Athletics in 1994 and 1998. He was the announcer for the 1988 Olympic Trials when Florence Griffith Joyner set the world record.