Dr Walther is Professor of Financial Economics at Saïd Business School and Associate Member of Nuffield College.

Ansgar's work focuses on the following topics:
Financial crises and regulation
The role of imperfect information in finance and macroeconomics
The impact of machine learning and AI on financial markets

Ansgar is a member of the Finance Theory Group and CEPR, and sits on the editorial board of the Review of Economic Studies and the Review of Finance.