David Jonathan Heyman (born 26 July 1961) is a British film producer and the founder of Heyday Films. Heyman is best known as the primary producer of all eight installments of the Harry Potter film series, which are based on a series of popular fantasy novels of the same name by author J. K. Rowling. He then produced all three installments of its spin-off prequel series, Fantastic Beasts. His work makes him the second-most commercially successful producer of all time.