John and his sister Sinead Kerr represented Great Britain at the Winter Olympics in 2006 and 2010 finishing in the top 10 on both occasions.
At the 2006 Olympics in Turin they performed to Scottish music from the Porridge Men which was choreographed for them by the 1984 Olympic champion Christopher Dean. Their coach from 2000-2006 was Joan Slater OBE who is the mother of two-time Olympian, and former Dancing on Ice judge, Nicky Slater.
After the 2006 Olympics John and Sinead moved to the US to work with 1994 and 1998 Olympic champion Evgeny Platov. Throughout their career the Kerrs were known for their innovative choreography and choices in music. This made them crowd favourites all over the world especially in Japan where they have performed on numerous occasions.
In 2009 they won a bronze medal at the European Championships using music from the celebrated British rock band ‘Muse’. For the 2010 Olympic season they used music from Johnny Cash and the American Indie rock band ‘Linkin Park’. Although an 8th place finish at the Vancouver Olympics was a big disappointment for them they had continued to push the boundaries by portraying an addict and an angel during their Linkin Park free dance. At the 2010 World Championships a few weeks later they gained a measure of redemption by finishing 5th.
The Kerrs were due to retire after the 2010 season but decided to do one more season to make up for their Olympic disappointment. They gained another bronze medal at the 2011 European Championships performing, again, to the music of Muse. They did not perform at the 2011 World Championships due to a serious shoulder injury suffered in training by Sinead. They subsequently decided to retire from competitive skating and now perform in exhibitions all over the world. They both live in the United States in the New York area.
At the end of their career they had won the British Championships a record 7 consecutive times- 2003-2009.
John was a member of the first BOA Athletes Commission from 2010-2012 in the lead up to the 2012 London Olympics. During the games John worked on the Ambitions Programme which allowed many aspiring young British athletes to attend a huge variety of Olympic events.