[2] Until 31 December 2021, Soussan has been CEO of dormakaba Holding AG, a global group in the access industry based in Switzerland.
Soussan studied mechanical and aeronautical engineering at the École Nationale Supérieure de Mécanique et d'Aérotechnique in Poitiers, France, and received her master's degree in 1992.
In 1993, she completed her Masters of Business Administration (MBA) from the Université de Poitiers in France and Trinity College Dublin in Ireland.
In 2011, she became Vice President Sustainability and Energy Management in the same division before moving to the Mobility Division of Siemens in 2013, first as Vice President Commuter and Regional Trains, then as CEO of the Rolling Stock Business Unit in 2015 and as Co-CEO of Siemens Mobility, a company offering transportation solutions, from 2017 onwards.
She joined about a year after the company was merged with rival Veolia following a much-publicized hostile takeover bid.