government office; and Robert Gibbs, former White House Press Secretary. Combining science and politics, Rajendra Kumar Pachauri was the elected chief of the Intergovernmental Panel on Climate Change (IPCC), an organization that shared the 2007 Nobel Peace Prize with Al Gore; Pachauri represented the IPCC in receiving the award. Abdurrahim El-Keib was the interim prime minister of Libya from November 24, 2011 to November 14, 2012. Alumnus Munir Ahmad Khan gained international recognition for his work in reactor quantum physics and later guided the scientific research in nuclear weapons for Pakistan's atomic bomb programs. NASA astronaut Christina Koch also attended NC State, earning two bachelor's degrees in Electrical Engineering and Physics and a Masters of Science in Electrical Engineering. Khalia Braswell, computer scientist, technologist, and founder of INTech earned her bachelor's degree from NC State in computer science. Several alumni hold or have held top positions at large companies. These include: Apple Inc. (Jeff Williams, chief operating officer), Caterpillar Inc. (James W. Owens), SAS Institute (James Goodnight), president and CEO), Tractor Supply (Hal Lawton, president and CEO), and HowStuffWorks (Marshall Brain). Over 50 NC State alumni have achieved the rank of brigadier general or higher in the United States military. General William C. Lee is often referred to as the "Father of the U.S. Airborne." General Maxwell R. Thurman, a former Vice Chief of Staff of the U.S. Army, was the first four-star officer from NCSU. Hugh Shelton, now retired, was a former Chairman of the Joint Chiefs of Staff and a four-star general. General Dan McNeill commands the International Security Assistance Force in Afghanistan. Some alumni have become national academic leaders. Albert Carnesale was the chancellor of UCLA from 1997 to 2006 after a 23-year tenure at Harvard University. Bill Friday served as president of the University of North Carolina system for 30 years. William Brantley Aycock served as chancellor of the University of North Carolina at Chapel Hill from 1957 until 1964. Notable contributors to the entertainment industry are associated with NC State. Actor and comedian Zach Galifianakis attended NC State. Country singer and American Idol winner Scotty McCreery attends NC State University. Donald Bitzer, the father of plasma television and Emmy Award winner, sits on the faculty of NC State. Musician and entertainment personality John Tesh also studied at NC State, but was expelled his junior year. Comedians and self-proclaimed "Internetainers" Rhett and Link also attended NC