Kirk became a billionaire thanks to big bets on two neuroscience drugs: Vyvanse, for attention deficit hyperactivity disorder, and Viibryd, for depression.
According to court documents, officials with the Department of Health and Human Services' inspector general's office installed software on Mr. Liang's work computer that collected screen shots showing how he accessed the tracking system to follow Viibryd matters, including a document recommending approval of the drug.