Interview with Dr. Ryan Garlick for the Osher Lifelong Learning Institute (OLLI) podcast. In this episode, Susan speaks with Dr. Ryan Garlick, Principal Lecturer in UNT's Department of Computer Science and Engineering. They discuss his codebreaking work, including his participation in TV programs such as National Geographic's "Hunt for the Zodiac Killer." Dr. Garlick gives an overview of the codebreaking methods that are being used to decipher the Zodiac's mysterious messages and also talks about his academic and professional background.