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Willis began fencing at Hazel Grove High School after meeting Bob Merry, a fencing coach who encouraged him to take up the sport. His father, a postman, was also keen on sport. Willis joined an after-school club, where he won a team foil competition. Following this he took part in three Under-15s competitions: he won two and came second in the other. At this point Willis still considered fencing to be "a bit of fun", although he continued it because of his height. He decided that épée was the weapon best suited to him and entered a North-West Under-16s event, which he won.
The first senior competition Willis took part in was the Merseyside Open, in which he reached the quarter-finals.
After this Willis approached Stockport Sword Club's head coach, Professor Andrew Vincent. Andy offered to coach Willis for free because Willis could not afford it. Willis has been training with Vincent for 13 years. During this time he has gone through a variety of jobs, got a degree in mechanical engineering and obtained accountancy qualifications. He has won two Commonwealth Fencing Championship medals: a silver medal in 2002 and a bronze medal in 2006.
In March 2007, Willis took part in a World Cup event in Germany. where he received gold, therefore becoming the first British fencer to win a World Cup event since 1981, under the coaching of Vincent. He won his second World Cup in Kish Island, Iran in January 2010.
In 2007, Willis worked for and was sponsored by B&Q. Their backing allowed Willis to train almost full-time and to travel over-seas for competitions. He was contracted to work 12 hours a week but was given time-off for sporting events. Willis hoped to take part in the 2012 London Olympics. The British Olympic Pathway Programme dropped Willis from funding for 12 months in April 2009 for unknown reasons. However, Jon continued to compete on the World Cup circuit, self funding his way around the world with help from friends and family. Jon was put back on funding after making 3 World Cup finals including the win in Kish Island and a Silver medal at Sydney, in May 2009. Jon has now retired from International fencing after failing to be selected for Team GB and a failed appeal
In March 2010, Jon left his home town club of Stockport and moved to live and train in Heidenheim, Germany.
- Barden, Mark (29 March 2007). "Fencer's 'duel' role". BBC. Retrieved 8 September 2009.
- Hubbard, Alan (22 April 2007). "2012 Olympics hopefuls: Jon Willis, fencer". London: The Independent. Retrieved 8 September 2009.
- Williams, Ollie (12 June 2012). "London 2012: Fencing selectors defend team as squad completed". Retrieved 29 November 2015..