Jem graduated from the London School of Economics with a BSc in Government. He volunteered, then worked as a youth worker, in the Jewish community delivering informal education activities to young people on topics such as mental health, social action, and sexual health. He has previously served on the boards of The Advocacy Academy and Sweet Cavanagh and is now a trustee of FPA. In 2013 Jem founded the charity and social enterprise The Bike Project who provide second-hand bikes to refugees and asylum seekers in London. Jem has since won several awards including the Social Entrepreneur of the Year Award 2015 and EU Social Innovation Impact Award 2017.