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Guillaume Toison began their work experience in 2004 as an IT consultant for Amundi. From 2005 to 2006, they worked as a Quant analyst for the same company. In 2006, they joined Lehman Brothers as a Portfolio Manager and stayed there until 2010. During their time at Lehman Brothers, they automated risk, trading, and client reporting functions into a Portfolio Management System, which became the backbone of the company. In 2010, Toison joined TOBAM as a Senior Portfolio Manager, where they grew the engineering team and designed the system architecture. In 2015, they became the Co-deputy CIO and Head of Equity at TOBAM.

Guillaume Toison completed their Master's degree in Computer Science from Telecom Paris between the years 2001 and 2004.