Jack started his jumping career when he was 10 years old. At that time, his biggest motivation was his grandpa Jan Mooy, who gave Jack his first pony. He learned a lot of him and was always supported by him, his mother (Ageet Ansems-Mooy) and father (Jaco Ansems). He had a successful period while riding ponies and as Junior and Young Rider, he rode different European Championships, won several medals with the team and as individual.

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In 2005 he started to work for VDL and gained experience at large competitions all over the world. He had a great time at VDL but after these years of experience, he decided to focus himself on his own stable ‘Stal Tandhof’.  

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