Ian Lowell Crocker (born August 31, 1982) is an American former competition swimmer, five-time Olympic medalist, and former world record-holder. During his career, he set world records in the 50- and 100-meter butterfly (long course and short course) and the 100-meter freestyle (short course). He has won a total of twenty-one medals in major international competition, spanning the Olympics, the FINA World Aquatics Championships, and the Pan Pacific Swimming Championships. He coached for many years at the Western Hills Athletic Club and has helped coach the Longhorns swim camp in 2019 as well as other years. Since Spring of 2022 when the new facility opened, Crocker coaches at the Western Aquatics and Social Club at the Eanes Independent School District Aquatics center. Career Crocker, who specializes in the butterfly, has received five Olympic medals in his career. In addition to his accomplishments at the Olympics, Crocker was the first man to ever swim under 51 seconds in the 100-meter butterfly. Crocker improved his world record of 50.98 twice, down to a time of 50.40 set at the 2005 World Aquatics Championships in Montreal, before being bested by Michael Phelps in 2009. 2000-2001 At the 2000 Summer Olympics in Sydney, Crocker was a member of the gold medal-winning 400-meter medley relay team and barely missed winning a bronze in the 100-meter butterfly. At the 2001 World Aquatics Championships, Crocker won a silver medal in the 100-meter butterfly, finishing behind Lars Frölander. 2003 World Aquatics Championships At the 2003 World Aquatics Championships, Crocker won a total of three medals, two golds and one silver medal. In his first event, the 50-meter butterfly, Crocker won a silver medal finishing behind Australian Matt Welsh, who set the world record. Crocker is best known in these Championships for his world record performance in the 100 m butterfly final. After the semi-finals of the 100-meter butterfly, it seemed Crocker was out of the gold medal position after Andrii Serdinov and Michael Phelps went under the former world record. However, in the final of the 100-meter butterfly, Crocker swam a 50.98 to become the first man under 51 seconds and win the gold medal. When Crocker saw the time after the race, he thought the world record belonged to Phelps. Crocker earned his final medal, a gold, in the 4×100-meter medley relay. The American team recorded a time of 3:31.54 to beat the former world record set