Panjab University, Chandigarh, where (apart from conducting research in a variety of subjects in mathematical physics) he continued his mission of teaching the fundamentals of statistical mechanics. In 1969 Pathria returned to Canada and, in addition to his other academic pursuits, continued to teach a variety of courses at the University of Waterloo and the University of Windsor. In 1972 the Pergammon Press, Oxford, published his classic text Statistical Mechanics, which became an instant success on the international scene. In the early 1990s, when his new publishers (Butterworth-Heinemann) persuaded Pathria to produce a second edition of this text, he sought the help of Surjit Singh, a former student of his from the Chandigarh days (who had also been a postdoctoral fellow with him at Waterloo during the years 1983–87). The result of this joint effort was a brand new edition of this book that came out in July 1996 and, like its predecessor, continued to be a bestseller. Pathria retired from the University of Waterloo in August 1998 and, soon thereafter, moved to the west coast of the US and became an adjunct professor of physics at the University of California at San Diego – a position he continued to hold till 2010. In 2009, Pathria's newest publishers (Elsevier/Academic) prevailed upon him to produce a third edition of this book. He now sought the help of Paul Beale, of the University of Colorado at Boulder, whose co-authorship resulted in another brand new edition in March 2011. Ten years later, in 2021, Pathria and Beale produced a fourth edition of this book. Research interests Raj Pathria has published over 110 research papers in a variety of international journals of repute. These papers are mainly spread over the following topics. Superfluidity in liquid helium II --- one of the topics of Pathria’s Ph.D. thesis. Lorentz transformation of thermodynamic quantities --- another topic of Pathria’s Ph.D. thesis. Polymers and the Theory of Numbers --- a fascinating subject pursued in collaboration with V.S. Nanda. Finite-size effects in systems undergoing phase transitions --- the main topic of Pathria's life-long pursuit. An exact evaluation of ‘lattice sums’ using Poisson’s summation formula. A study of ‘stochastic phenomena in sociology’ --- pursued in collaboration with Karmeshu. Finite-time thermodynamics --- a new ripple in an old pond. Relativity and Cosmology. Pathria's complete list of publications can be seen here. Honours Fellowship of the American Physical Society, 1976 Recipient of