[3] He has produced a number of films and television programmes, including The Invisible War, Icarus, the Peabody Award-winning documentary All That Breathes,[4] The Interrupters, Dreamcatcher, We Are Together, Rough Aunties, Mayor, The Art of Political Murder, George Carlin's American Dream and Plebs.
He is a member of the Academy of Motion Picture Arts and Sciences,[5] BAFTA and the Producers Guild of America.
Leifer’s career began in 2006 with We Are Together, a documentary about the orphanage, Agape, in South Africa, which won the Special Jury Prize and Audience Award at Tribeca Film Festival.
[6] He then produced Rough Aunties, his first collaboration with director Kim Longinotto, which won the Grand Jury Prize in the 'World Cinema — Documentary' category at the 2009 Sundance Film Festival.
[12] He also produced Dror Moreh’s The Human Factor, about the United States’ 30-year effort to bring peace to the Middle East.