In early January, the U.S. House Committee on Energy and Commerce began investigating celebrity endorsements in television ads for brand-name drugs. The investigation was sparked by Pfizer's commercials for its best-selling cholesterol drug Lipitor. These direct-to-consumer (DTC) ads feature Dr. Robert Jarvik, a pioneer in the development of the artificial heart. Viewers are not told that Jarvik is not a cardiologist, nor is he licensed to practice medicine. His presentation as a trusted expert, Pfizer presumably hopes, is enough to persuade viewers to ask their doctors for Lipitor by name. And that would help erode the increasing competition from generic alternatives.