Bertram always rode horses when he was young. Originally from Ireland, he later moved to Germany for a few months, but once he settled there he decided to stay permanently to develop his jumping skills. Bertram made his international debut on the Irish Nation's Cup team in 2013. In 2014, he won the first leg of the World Championship and became an overnight star. The most influential people in his career have been Irish equestrians Con Power and Billy Twomey.