She competed in the 1980, 1984, 1988, 1992, 1996, 2000 and 2004 Paralympic Games. In the 1996 Games in Atlanta, she won more medals than any other athlete: two gold, three silver and three bronze. She had also topped the individual medal table at the 1992 Games in Barcelona, with ten gold medals and two silver. She had won seven gold medals during her first Games in 1980.
Following the Athens Games in 2004, she had won 52 medals at the Paralympic Games, more than any other athlete, of any nationality. Of those, 37 were gold medals, 10 were silver and 5 were bronze. After the Sydney Games in 2000, she also held eight world records in her disability category (50 m backstroke, 100 m backstroke, 200 m backstroke, 200 m individual medley, 400 m individual medley, 200 m breaststroke, 4×50 m medley relay, 4×50 m free relay).
The medals without relay races from 1980 Summer Paralympics to 1988 Summer Paralympics, are 46 (32, 9, 5) for IPC. The relay team of United States, in the category of Zorn, won 5 gold and 1 silver in these three Paralympics. The question marks in the infobox refer however to 9 gold medals (not 5 gold and 1 silver medal), this is to confirm the total number of 55 (of which 41 gold), reported in many websites including that of the official IPC in another of his article.