Jamie Nussbaumer is the son of Austrian Toni Nussbaumer, who became a hotelier and businessman in Guernsey. He attended school at Elizabeth College, Guernsey. During his time at school, he represented them in cricket, scoring a maiden century in his first match after being called up to replace a player who had gone to watch England against Australia at the Rose Bowl in Southampton. He also played club cricket for Cobo Cricket Club. In 2009, he was invited to join Sussex County Cricket Club on a pre-season training camp in South Africa. In 2010, he played for Sussex's academy in a one day tournament. In 2012 during the 2012 Summer Olympics in London, he expressed a comment that "Dressage is just not a sport" after Sark born Carl Hester had won gold in the team dressage event.
