Dr. Gaurav Khanna is a theoretical astrophysicist at the University of Massachusetts, Dartmouth and a huge Apple fan. His specialty is the computational study of gravitational phenomena in the vicinity of black holes. John first got to know Dr. Khanna when Apple was pursuing supercomputing hardware and software in the early 2000s, and Dr. Khanna's technical support for scientific computing on Macs made him a hero in the community. In this interview, John asks Dr. Khanna about his current day research using his 2013 Mac Pros, his use of Apple's OpenCL for parallel computing and thoughts on Apple's support for the scientist.