Matthias J. Ehrhardt is a post-doctoral research associate in the Cambridge Image Analysis group at the Department for Applied Mathematics and Theoretical Physics, University of Cambridge. Previously he has been with the Centre for Inverse Problems and the Centre for Medical Image Computing at the University College London (UCL). He obtained his PhD from UCL in 2015 and his Diploma from the University of Bremen, Germany in 2012. His research interests comprise inverse problems, non-smooth / (non-)convex / stochastic optimization, sparsity, and signal and image processing in particular application of these techniques to medical imaging.