Arttu Rajantie is a Professor of Theoretical Physics at Imperial College London. His research lies on the interface of quantum field theory and theoretical cosmology, and he has a particular interest in non-linear and non-equilibrium processes. His current work focuses on the dynamics of the Higgs field in the early Universe and its potentially observable consequences, as well as on the production and dynamics of magnetic monopoles. He is a member of the MoEDAL collaboration which is searching for magnetic monopoles and other highly ionising particles at the Large Hadron Collider. Arttu is from Finland and got his PhD from the University of Helsinki. Before moving to Imperial College, he held postdoctoral positions at the universities of Sussex and Cambridge.