Sculley was best known at Pepsi for the Pepsi Challenge, an advertising campaign he started in 1975 to compete against Coca-Cola to gain market share, using heavily advertised taste tests. It claimed based on Sculley's own research that Pepsi-Cola tasted better than Coca-Cola. The Pepsi Challenge included a series of television advertisements that first aired in the early 1970s, featuring lifelong Coca-Cola drinkers participating in blind taste tests. Pepsi's soft drink was always chosen as the preferred product by the participant; however, these tests have been criticized as being biased. The Pepsi Challenge was mostly targeted at the Texas market, where Pepsi had a significantly lower market share at the time. The campaign was successful, significantly increasing Pepsi's market share in that state. At the time the Pepsi Challenge was started, Sculley was senior vice-president of United States sales and marketing operations at Pepsi. Sculley himself took the taste test and picked Coke instead of Pepsi.