American Film Institute exec VP Jonathan Estrin will step down on Sept. 28 after a three-year stint in order to pursue other opportunities.He will continue as a consultant for AFI on a number of projects. “Jonathan Estrin is a first-class person whose commitment and insights were particularly valuable to AFI during a transitional period,” said outgoing AFI prexy and CEO Jean Picker Firstenberg. Estrin helped to set up the AFI Dallas Film Festival, which debuted in March. He also turned the AFI K-12 Screen Education Center into an online resource for public school teachers and students. Estrin is penning a play for Participant Prods.