Guber was approached by Benjamin Melniker and Michael E. Uslan of the newborn Batfilm Productions in 1979. They proposed to him a serious and dark Batman film project. At the time, Guber was an associated of Neil Bogart for Casablanca Records, in turn associated with Universal Pictures. He proposed the project to Universal, but it was rejected. Also, Frank Wells, the then Vice Chairman of Warner Bros., was eager to keep the Batman property inside the studio, so this led Guber and associates to start bargaining with Warner, beginning to develop the project concretely.
Guber began his film career as an employee for Columbia Pictures, and after a few years he became head of the studio. Then he moved to work in the subsidiary Sony Pictures Entertainment where he was promoted to chief executive and chairman. In 1976 he resigned from Columbia to act on his own, founding the FilmWorks Inc., and a year later he's associated with Neil Bogart of Casablanca Records to form the Casablanca Records and Filmworks. After a few years of activity for television with Casablanca-FilmWorks, in 1979 Guber creates PolyGram Pictures where he was elected chairman and co-head of distribution until 1983. In 1980, it is associated with Jon Peters and Neil Bogart and together they founded the Boardwalk Company. In 1983 he became the sole partner of Peters, thus founding the Guber-Peters Company. Together they produce great successful films such as Missing (1982), Flashdance (1983), The Color Purple (1985), The Witches of Eastwick (1987, starring Jack Nicholson and Michelle Pfeiffer), Gorillas in the Mist (1988) and Rain Man (1988).
The two took the biggest risk, which then marked their biggest success, with Batman (1989). After this, Peters and Guber got a seven years million dollar contract with Warner Brothers.
After a few months, they were courted by Sony Corporation, which offered one billion dollars for take the place of general managers. Subsequently, Guber founded, in solitary, the Mandalay Entertaimment Group, producing films such as Donnie Brasco, Seven Years in Tibet, Les Misérables (starring Liam Neeson and Uma Thurman), Sleepy Hollow (directed by Tim Burton, with Michael Gough), and The Score.