Hans-Dieter grew up with horses and began horseback riding in his father’s riding school when he was a child. At seven he attended his first competition and was subsequently Junior Area Champion twice. Hans also won two Young Rider National Champion titles before moving into seniors. After leaving his father's stable, Hans rode for Pierre Baldeck and then Hans Brändlin. Hans won the LGCT Grant Prix at Chantilly in 2012 and picked up a Bronze and Silver medal in LGCT Grand Prix in 2013 and 2015.