Dr. Ronald Sterkenburg is a professor at the School of Aviation Technology and Transportation at Purdue University, and has taught at Purdue since 1999. He is an author or co-author of 13 books and more than 60 publications in national and international journals and conference proceedings. He is a certificated A&P mechanic, holds an Inspection Authorization (IA) and performs the duties of a Designated Mechanic Examiner (DME). Dr. Peng Hao Wang is an assistant professor of aviation technology at Purdue Polytechnic and researches the use of composite materials to improve modern aircraft design and maintenance. He is an FAA certificated airframe and powerplant (A&P) mechanic.