UAB researcher and physician Dr. Michael Saag is know around the world as an AIDS expert. He started working with AIDS in the early eighties, a time when the disease was masked in uncertainty. Since then, he's made AIDS research and improving patient treatment his life's work. This month, Dr. Saag published his memoir "Positive: One Doctor's Personal Encounters with Death, Life and the U.S. Healthcare System." Dr. Saag spoke with WBHM's News Director Rachel Osier Lindley about the book, what it's like to lose a patient and his deep concerns about the U.S. healthcare system.