Dr. Lindsey Thornhill is an executive vice president at IS4S, serving on the board of directors. Since joining IS4S in July 2015, Lindsey has been engaged in new business development efforts and managing a team of scientists and engineers to develop and demonstrate novel prototype technology for the Department of Defense (DoD).  

Before joining IS4S, Lindsey was an assistant vice president and manager of the Advanced Concepts Division at Science Applications International Corporation (SAIC). At IS4S and SAIC, Lindsey has led teams to execute technology development programs across a broad spectrum of engineering sciences and for a diverse set of applications, including advanced air-delivered weapon systems, chemical and biological agent defeat, autonomous robotic systems, hybrid power systems, and algal biofuel systems for customers including DARPA, DTRA, AFRL, ARL, TARDEC, and others. 

Lindsey earned B.S., M.S., and Ph.D. degrees from the George W. Woodruff School of Mechanical Engineering at Georgia Tech, where he was awarded the Sigma Xi Research Award for M.S. thesis of the year. He was also selected to receive SAIC’s prestigious Physics Publication of the Year award for a paper based on his dissertation, which appeared in the Cambridge Journal of Plasma Physics. Lindsey served for six years on the Woodruff School External Advisory Board, as chair for the last three years. He also served three years on the College of Engineering Advisory Board at Georgia Tech. He completed a term of service on the Board of Visitors at the University of Georgia, where he is still a member emeritus. 

During his tenure at SAIC, Lindsey was recognized for several significant contributions. He received the Community Involvement Award for his volunteer work with universities. He was selected for SAIC’s Corporate Leadership Mentoring Program and for the CEO’s Stock Compensation Award, an award made in recognition of significant technical and financial contributions to the company. Lindsey received the Corporate Achievement Award for Excellence in Science and Technology for advancing electro-thermal chemical launcher technology. He also received an award from the Center for Advanced Studies at Wheeler High School for mentoring students in the Senior Research Experience Program. 

Lindsey has authored numerous publications, served as a reviewer for peer-reviewed journals, and delivered invited talks at international conferences and before the DoD's JASON Panel. He has also served on graduate student advisory committees and co-founded and directed student paper competitions at Georgia Tech and Clark Atlanta University.