|Full name||Mark Webster Chatfield|
|National team||United States|
August 11, 1953|
|Died||December 23, 1998(aged 45)|
|Height||6 ft 0 in (1.83 m)|
|Weight||161 lb (73 kg)|
|Club||Pasadena Swimming Association|
|College team||University of Southern California|
Chatfield won the gold medal in the 100-meter breaststroke at the 1971 Pan American Games. He represented the United States as a 19-year-old at the 1972 Summer Olympics in Munich, Germany. He advanced to the event final of the men's 100-meter breaststroke, finishing fourth overall with a time of 1:06.1.
He was the 1973 U.S. national champion in the 100-yard breaststroke (57.36). He attended the University of Southern California (USC), where he swam for the USC Trojans swimming and diving team from 1972 to 1975. As a college swimmer, he was recognized as an All-American in 1972 (100-yard breaststroke, 200-yard breaststroke), 1973 (100-yard breaststroke, 200-yard breaststroke, 400-yard medley relay), 1974 (100-yard breaststroke, 200-yard breaststroke, 400-yard medley relay), and 1975 (100-yard breaststroke, 200-yard breaststroke, 200-yard individual medley, 400-yard medley relay).
An accomplished Baroque and period musician, vocalist and composer, he played cello and was a countertenor.
Chatfield died of lymphoma on December 23, 1998; he was 45 years old.