[1] Touzi’s most cited work, Applications of Malliavin Calculus to Monte Carlo Methods in Finance,[2] was published right before this career change in August 1999.

[citation needed] In September 2005, Touzi accepted a new position as the Chair in Mathematical Finance at the Tanaka Business School of Imperial College London.

He worked at the Tanaka Business School for almost a year before holding his most recent and current position as a professor of applied mathematics at École polytechnique.

[1] Touzi's most cited paper, Applications of Malliavin Calculus to Monte Carlo methods in finance, co-authored by Eric Fournié, Jean-Michel Lasry, Jérôme Lebuchoux and Pierre-Louis Lions, describes an original probabilistic method to compute option contract Greeks: delta, gamma, theta, and vega.

Their approach, when computed on standard European option contracts and compared to results yielded from the Monte Carlo method, happens to be more efficient.