Paul Popelier is a Professor of Chemical Theory and Computation at the University of Manchester with an interest in Quantum Chemical Topology (QCT). He has published 3 books and more than 250 papers in a wide variety of journals fetching ~17,000 citations and an h-index of 63. He has over 30 single author publications and has pioneered the pKa prediction method AIBl, the protein force field FFLUX and the chemical insight extractor REG.