Masterson started out in the business as a child model and landed a role on family film Beethoven 2. He also starred as the beloved "Steven Hyde" in the hit Television series That 70`s Show. In December 2017 Masterson was fired from the ranch , after rape allegations were filed from 4 women
His siblings are actors as well, brother Christopher Masterson and half-siblings Jordan and Alanna Masterson. He is married to Bijou Philips.