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.
2010 European Pony Championships Individual Gold and Team Silver medallist with Cassandra van het Roelhof
2012 European Junior Championships Team Gold medallist with Wild Thing L
2013 European Junior Championships Individual Silver medallist with Molly Malone V
Competed in the 2014 World Championships, finishing 7th individually with Molly Malone V
2015 LGCT Paris Grand Prix winner with Romanov
2016 Global Champions League Team Rider for Valkenswaard United