He was born to Joachim Jung, a former dressage and show jumping competitor and took up horse riding aged 6. He won individual bronze at the 2009 European Championships. At the 2012 Olympic Games, he won gold medals in the individual and team events. In winning the individual event (on his 30th birthday), he made eventing history by becoming the first rider to ever hold the Olympic, World and European championship titles at the same time, having previously won the 2010 World title and 2011 European title. He won all three titles on the horse La Biosthetique Sam.