David joined the Los Angeles Times in 1990 and moved to its Washington bureau in late 1994. His reports on the Food and Drug Administration’s drug approval process won the 2001 Pulitzer Prize for Investigative Reporting, and his detailing of the deaths associated with Rezulin, a drug for Type 2 diabetes, led to the safety withdrawal of the product. Later, his unearthing of consulting fees and stock payments from drug companies to officials at the National Institutes of Health resulted in a ban against such compensation. David left the Times in late 2008 to write a book, "The Mirage Man," about the 2001 anthrax letter attacks, and he rejoined the Times in 2011. He previously worked as a reporter for the San Jose Mercury News in California and in Washington, D.C.