**Date and time:**

The 2019 Cantrell Lecture Speaker will be Professor Geordie Williamson of the University of Sydney.

Professor Williamson is one of the world's foremost experts in geometric representation theory. His counterexamples to the Lusztig conjecture have led to new and exciting research in the area of modular representation theory, in which he is one of the leaders. Another of his major accomplishments involves joint work with Ben Elias which settled a long-standing conjecture about positivity of Kazhdan-Lusztig polynomials for arbitrary Coxeter groups. Professor Williamson was awarded the Chevalley prize of the AMS (2016), a Clay Research Award (2016), the EMS prize (2016), the New Horizons in Mathematics prize (2017), and was elected a Fellow of the Royal Society (2018).

The lecture series will be scheduled the week of August 26, 2019. Exact dates and time forthcoming.