Born in India, he studied engineering at the Regional Engineering College at Warangal, affiliated with Osmania University in Hyderabad, India, and received a bachelor’s degree in mechanical engineering in 1964 and a Master’s degree in heat power engineering in 1966. He then pursued his doctoral studies at Monash University in Australia under the guidance of R. H. Brown where the subject of his dissertation was the mechanics of chip segmentation in machining. After receiving his doctorate in 1972, he began his career as a research engineer and assistant professor in the mechanical engineering department at Carnegie Mellon University. It was at CMU that he began his collaborations and developed his lifelong friendship with Professor Milton Shaw. Their collaboration led to seminal publications in Nature and Philosophical Magazine on the wear of diamond in the grinding of ferrous metals. For his fundamental contributions to understanding metal build-up in grinding with aluminum oxide abrasives, he was awarded the F. W. Taylor Medal of CIRP in 1977. Ranga then moved to the General Electric Corporate Research and Development Laboratory in Schenectady, NY where he performed research on the machining of titanium and on high speed/high productivity machining. At the same time, he also held a position of Adjunct Professor at Rensselaer Polytechnic Institute. Then, during the period from 1986 to 1989, while on a research sabbatical from GE Corporate R and D, Ranga went to the National Science Foundation where he held positions of Program Director in several programs including Materials Engineering and Processing, Tribology and Manufacturing Processes. He also served in NSF’s Division of Design, Manufacturing and Computer-Integrated Engineering (DMCE) as a Deputy Division Director and Acting Division Director. In the Fall of 1989, he joined Oklahoma State University and the School of Mechanical and Aerospace Engineering as Professor and MOST Chair in Intelligent Manufacturing where he remained on the faculty for 22 years.