David Tong is a theoretical physicist at the University of Cambridge. He is a professor in the Department of Applied Mathematics and Theoretical Physics and a fellow of Trinity College. He received his Ph.D in theoretical physics from the University of Wales, Swansea in 1998. He has been a research fellow at TIFR in Mumbai, India, an EPSRC postdoctoral fellow at King’s College in London, a postdoc at Columbia University, a Pappalardo fellow at the Massachusetts Institute of Technology, and a visiting researcher at SLAC. His work is on quantum field theory, a vast topic which touches upon many different parts of physics and mathematics. Over the years, he has studied aspects of quantum field theory related to string theory, supersymmetry, solitons, geometry, cosmology and condensed matter physics.