John Moffat is a theoretical physicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada. For most of his career, he was Professor of Physics at the University of Toronto, supervising graduate students towards their PhD degrees and teaching undergraduate and graduate physics courses. Moffat is best known for his research in gravitation, astrophysics, astronomy, cosmology, and particle physics. In these diverse fields, he has proposed numerous alternative theories to the prevailing ones. In 1953, Albert Einstein personally, though perhaps unintentionally, opened doors for Moffat in the field by introducing him to other well-known physicists. This led him to Trinity College, Cambridge University, and a PhD without an undergraduate degree. To date, Moffat has published over 300 scientific papers in peer-reviewed journals, and he is a Fellow of the Institute of Physics. His most recent book, Cracking the Particle Code of the Universe, published in 2014.