Marios Petropoulos, an Associate Professor at Ecole Polytechnique Paris, visited the department for two days during the week of 11 March for research interaction with the Fields, Strings and Geometry Group, and to give a colloqiuium on the Friday.  The title of his colloqiuium was “Gravitational instantons, Ricci flows and modular forms“.  His webpage at Ecole Polytechnique can be found here