 Kellner was present at the creation of the Fox Broadcasting Company, which was then considered a radical idea, as it was taking on the three networks that had dominated American television since the 1950s, ABC, CBS and NBC (CBS and NBC were really the "big two", in regards to ratings and number of affiliates, until ABC experienced a surge in popularity in the late 1960s).Despite incredible skepticism, Kellner was part of the team that gave the network the "attitude" that has marked the network ever since.Among the shows that emerged during Kellner's seven years at Fox were "The Simpsons", "Married... with Children", "Beverly Hills, 90210", "Melrose Place" and "In Living Color".