Big Brother 17 houseguest John McGuire, aka Johnny Mac, Rockstar Dentist, is just 27-years-old. It’s difficult to imagine that the awkward, loud talker is a professional dentist. But it is true. According to PAHomePage, McGuire works at Keystone Dental Center in Scranton, Pennsylvania.
McGuire says he wants to win the $500,000 to help pay off his college loans. He earned his BS in Finance from Penn State University in 2009 and his DMD from Temple University in 2013. When not on the reality show, McGuire lives with his parents in Jefferson Township, PA. Big Brother airs Sundays at 8pm on CBS.