Wolfson is the latest incarnation of a trend that long precedes him. Those wary of vaccinations have always latched onto any doctor who affirms their reservations, regardless of the absence of research supporting them. Before Wolfson, there was Sherri Tenpenny, an osteopath who long inveighed against vaccinations and just canceled an Australian tour, citing fears of "anti-free speech terrorists" and "pro-vaccine extremists." And before Tenpenny, there was Britain's Andrew Wakefield, who authored a study — since retracted — linking autism to vaccines. After it was thoroughly discredited, it cost him his medical license. But it also got him a following.