Will earned his PhD from the University of Nottingham in 2010, on the evolution of galaxies in the distant universe using the near-infrared UKIDSS Ultra-Deep Survey. Will broadened his research interests into weak gravitational lensing cosmology surveys when he joined the Dark Energy Survey (DES), after moving to ETH Zurich in 2013, working primarily on photometric redshifts and survey data. In DES he held leadership positions in the galaxy evolution and science release working groups, and still leads the DES deep fields team. He joined Dark Energy Science Collaboration of the Vera Rubin Observatory during his third post-doc position, at UCL, leading the photometric redshifts working group, before switching to Euclid in 2019 when he moved to the Observatoire de Genève. He now works on the many aspects of OU-PHZ activities in Euclid, and the links with upstream and downstream aspects of the pipeline and science exploitation. In addition, he co-leads the work package and key science project on the statistical distribution of galaxies.