Mathematical Finance Seminar Series

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Schedule for Fall 2021

Seminars are on Thursdays
Time: 4:10pm - 5:25pm
Attention: All talks are available online, via Zoom. Select talks take place in hybrid mode. In-person participation is only available to Columbia affiliates with building access.

Join URL:

Meeting ID: 933 7454 7641

Passcode: bachelier

Organizers: Ioannis Karatzas, Marcel Nutz, Philip Protter, Xiaofei Shi, Johannes Wiesel


*This talk will take place in hybrid mode.

Paolo Guasoni (Dublin)

Title: Rogue Traders

Abstract: Investing on behalf of a firm, a trader can feign personal skill by committing fraud that with high probability remains undetected and generates small gains, but that with low probability bankrupts the firm, offsetting ostensible gains. Honesty requires enough skin in the game: if two traders with isoelastic preferences operate in continuous-time and one of them is honest, the other is honest as long as the respective fraction of capital is above an endogenous fraud threshold that depends on the trader’s preferences and skill. If both traders can cheat, they reach a Nash equilibrium in which the fraud threshold of each of them is lower than if the other one were honest. More skill, higher risk aversion, longer horizons, and greater volatility all lead to honesty on a wider range of capital allocations between the traders.

Ciamac Moallemi (Columbia GSB)

Kostas Spiliopoulos (Boston University)


Erhan Bayraktar (University of Michigan)


No Seminar

Haoyang Cao (Alan Turing Institute)


*This talk will take place in hybrid mode.

Martin Larsson (CMU)







*This talk will take place in hybrid mode.

Viktor Todorov (Northwestern)