USF Associate Professor of History David K. Johnson has been on TV a lot lately, and for good reason: He’s doing important work. A recent guest on CBS’s Sunday Morning with Mo Rocca and CNN Tonight with Don Lemon, he’ll be seen tonight on PBS in the powerful documentary based on his book, The Lavender Scare, when it makes its national television debut at 9 p.m.  The book and the documentary uncover the shocking story of the hundreds of thousands of U.S. State Department employees fired from their jobs from the 1950s right up until the mid-1990s, simply because they were gay or lesbian. His latest book, Buying Gay, explores how so-called “physique” magazines of the 1950s and ’60s became an important catalyst for the gay rights movement. In this week when Tampa Bay is celebrating Pride, the LGBTQ community and its allies can feel proud that one of our own is making a difference in how our stories are told.