Cécile Tandeau de Marsac is on the board of Sodexo SA, UNIBEL SA, Compagnie Daher SA and Verallia SA. In her past career she held the position of Director-Human Resources for Nestlé SA and Director-Human Resources of Nestlé France SAS (a subsidiary of Nestlé SA), Chief Human Resources Officer at Solvay SA and Director-Human Resources for Polyamide High Performance, Inc.

She received an undergraduate degree from Ecole Supérieure de Commerce de Rouen and a graduate degree from NEOMA Business School.