In 1959, Pennebaker joined the equipment-sharing Filmakers’ Co-op and co-founded Drew Associates with Richard Leacock and former "LIFE" magazine editor and correspondent Robert Drew. A crucial moment in the development of direct cinema, the collective produced documentary films for clients like ABC News (for their television series, "Close-up") and Time-Life Broadcast (for their syndicated television series, "Living Camera"). Their first major film, "Primary" (1960), documented John F. Kennedy and Hubert Humphrey's respective campaigns in the 1960 Wisconsin Democratic Primary election. Drew, Leacock and Pennebaker, as well as photographers Albert Maysles, Terrence McCartney Filgate and Bill Knoll, all filmed the campaigning from dawn to midnight over the course of five days. Widely considered to be the first candid and comprehensive look at the day-by-day events of a Presidential race, it was the first film in which the sync sound camera could move freely with characters throughout a breaking story, a major technical achievement that laid the groundwork for modern-day documentary filmmaking. It would later be selected as an historic American film for inclusion in the Library of Congress' National Film Registry in 1990.