Alan Greenberg is a writer, film director, film producer, and photographer. His film Land of Look Behind won the Gold Hugo Award at the Chicago International Film Festival. He is also the author of Love in Vain: A Vision of Robert Johnson. He has known and frequently collaborated with Werner Herzog for more than 35 years, helping him write the screenplay of Fitzcarraldo, among others. Werner Herzog is considered one of the world's greatest filmmakers. His films include Aguirre, the Wrath of God; The Enigma of Kaspar Hauser; Grizzly Man; Bad Lieutenant: Port of Call New Orleans; Cave of Forgotten Dreams; and Into the Abyss.His books include Conquest of the Useless and Of Walking in Ice.