Jameson was born in Crosby, Merseyside. His swimming career was initially centred on individual medley and backstroke events, but after studying at Arizona State University, he decided to specialise in the 100-metre butterfly and 100-metre freestyle events. Initially he represented England in the backstroke events, at the 1982 Commonwealth Games in Brisbane, Queensland, Australia. He had also won the 1982 ASA National Championship title in the 200 metres backstroke. A founder member of Kelly College Swim Squad in Tavistock Jameson represented Great Britain at the 1984 Summer Olympics in Los Angeles, where he finished 5th place in the 100-metre butterfly. He then won silver in the 100-metre butterfly at the 1985 European Championships, behind the German star swimmer Michael Gross. Jameson took bronze in the 100-metre butterfly at the 1986 World Championships, and then went on to take gold when representing England in the same event at the Edinburgh Commonwealth Games later that year. In addition to the gold he won a silver and bronze in the relay events and a bronze in the 100 metres freestyle. He went on to win the 1986 and 1988 ASA National Championship 100 metres butterfly titles, the 1988 ASA National Championship 100 metres freestyle title and the 200 metres backstroke title in 1982. He won gold at the 1987 European Championships in the 100-metre butterfly, and was also part of the team which took silver in the 4×100-metre medley relay and going into the 1988 Summer Olympics in Seoul, South Korea, he was one of the pre-race favourites to win, having been undefeated for over two years in the 100-metre butterfly. He qualified fastest into the final, where he took bronze in a time of 53.30 seconds, breaking both the British and Commonwealth records in the process.
Personal life
Jameson retired from competitive swimming in 1989. He commentates on swimming for the BBC with fellow Olympian Adrian Moorhouse. His older sister Helen was also a competitive swimmer, and represented Britain at the 1980 Olympic Games in Moscow and won a silver medal in the 4×100-metre medley relay. His younger sister Jo was a swimmer then became a primary teacher. He now lives in London with his wife Peggy Jameson, with whom he has two children, Maisie and Oscar.
