Drew Associates would produce nine more documentaries for "Living Camera", including "" which chronicled President Kennedy and Attorney General Robert F. Kennedy's conflict with governor George Wallace over school desegregation. Then in 1963, Pennebaker and Leacock left the organization to form their own production firm, Leacock-Pennebaker, Inc. Pennebaker would direct a number of short films over the course of two years. One of them was a rare recording of jazz vocalist Dave Lambert, as he formed a new quintet with singers such as David Lucas, and auditioned for RCA. The audition was not successful, and Lambert died suddenly in a car accident shortly thereafter, leaving Pennebaker's film as one of the few visual recordings of the singer, and the only recording of the songs in those rehearsals. The documentary got attention in Europe, and a few weeks later, Bob Dylan's manager, Albert Grossman, approached Pennebaker about filming Dylan while he was touring in England. The resulting work, "Dont Look Back" (there is no apostrophe in the title) became a landmark in both film and rock history, "evoking the '60s like few other documents", according to film critic Jonathan Rosenbaum. The opening sequence alone (set to Dylan's "Subterranean Homesick Blues" with Dylan standing in an alleyway, dropping cardboard flash cards) became a precursor to modern music videos. It was even used as the theatrical trailer. It would later be included in the Library of Congress' National Film Registry in 1998, and it was later ranked at No. 6 on "Time Out"s list of the 50 best documentaries of all time.