Denis Streiff graduated in 1986 from the French business school HEC, where he majored in International Tax and Law. Denis also holds a master degree in Law and a DESS in International Tax Law from Paris XII University.
Denis started in Paris with the law firm of Bureau Francis Lefebvre, in its international tax department. He first moved to the United States in 1994 to join its New York office. In his seven years of legal practice, Denis advised French and U.S. corporate clients on cross-border transactions.
Denis was hired by Omnicom Group Inc. in 1994 and spent most of his four years there as Assistant Treasurer, working on credit and bond financing, acquisition analysis, relationships with rating agencies and working capital management.
Shortly after Omnicom merged TBWA\International with GGT/BDDP in 1998, Denis became CFO International for TBWA, based first in Paris and then in New York, with responsibilities across Europe, Asia and Africa Middle East.
In 2008, Denis was made CFO of TBWA\Worldwide.