Fransson completed his PhD in Physics in 2002 at Uppsala University, Uppsala, Sweden, and postdoctoral studies The Royal Institute of Technology, Stockholm, Sweden, and Los Alamos Natl. Lab., Los Alamos, NM, USA. Since 2013 he has been a senior lecturer in theory for highly correlated materials and is active in the department of material theory. He is professor in Physics at Uppsala University since 2015. He has published more than 80 papers in reputed journals and written the text book Non-Equilibrium Nano-Physics.

His current focused research areas include Non-equilibrium condensed matter physics with special attention to the modeling of nanostructures systems and local probing techniques. Particular focus is directed on impurity scattering in two-dimensional systems, where the impurities possess bosonic (vibrational, spin, ...) degrees of freedom which give rise to inelastic scattering processes. Interactions between local defects adsorbed onto surface of modern materials e.g. superconductors, graphene, topological insulators, strongly spin-orbit coupled surfaces, and hidden order materials.