Dr. Henry "Harry" McDonald (born in Glasgow, Scotland) is the Distinguished Professor and Chair of Computational Engineering at the University of Tennessee in Chattanooga. He holds a BSc. and a DSc. from the University of Glasgow. McDonald was educated there in aeronautical engineering and worked in the U.K. aerospace industry on a number of both civil and military aircraft before immigrating to the U.S. In the U.S. he became a U.S. citizen and was a staff member in large corporate research laboratory, United Technologies Research Center, where he concentrated on turbomachinery and what eventually became known as Computational Fluid Dynamics. McDonald followed this by forming a small R&D company in Connecticut, Scientific Research Associates. It was while at Scientific Research Associates that McDonald, with Roger Briley pioneered the Block Implict Method, a scheme capable of obtaining numerical solutions to systems of nonlinear multidimensional partial differential equations. He was also asked to assist the NASA team investigating the Challenger disaster. Subsequently he became a member of the Lockheed Martin team investigating a Titan motor failure.