The British Taekwondo Executive Board has accepted the resignation of its chief executive Adrian Tranter with immediate effect for personal reasons.
This includes his roles on the Boards of both GB Taekwondo and Taekwondo Organisation Limited.
Tom Stammer will move from his role as vice-president of the Council to become acting chief executive.
"Adrian has been a remarkable leader for British Taekwondo for many years," read a British Taekwondo statement.
"His leadership has been both enthusiastic and inspirational and his success will be measured alongside taekwondo’s success at the 2012 London Olympic Games.
"We wish him and his family well at this time and every success in the future."
Great Britain claimed one gold and one bronze medal at London 2012 with Jade Jones topping the podium in the women’s under 57 kilogram category and compatriot Lutalo Muhammad finishing third in the men’s under 80kg class.
This was despite tension in the build-up due to to select Muhammad over then world number one Aaron Cook, who has since switched nationality to represent Moldova.
In January, Tranter was appointed an Officer of the Order of the British Empire (OBE) in the Queen's New Year Honours List.
The appointment came after a strong year for British Taekwondo both on and off the mat.
The 2014 World Taekwondo Federation (WTF) Grand Prix series saw Jones take gold in the final event in Mexico, before she had the honour of receiving the first-ever WTF Female Athlete of the year accolade.
The national governing body, which represents all aspects of the sport alongside GB Taekwondo, which supports the elite side, also established its first-ever Para Taekwondo Committee in a bid to garner support for the sport both in Britain and across the world.
Amy Truesdale led the way in this respect as she was crowned world, European and Commonwealth champion throughout 2014.
insidethegames has attempted to contact Tranter for a comment on his resignation and is awaiting a response.
January 2015: British Taekwondo President recognised in New Year's Honours List