Mr Martrenchar joined the group in 1980. He has held various positions within the network in France, including deputy managing director in the North-Picardy network and then head of the Lille group of branches.
He subsequently joined the domestic banking division, after which he was appointed head of distribution, products and markets of French Retail Banking (BDDF).
In 2003 Mr Martrenchar was made head of BDDF Retail, and then in 2009 head of distribution, markets and solutions for BNP Paribas Retail Banking.
BNP Paribas Retail Banking has over 135,000 employees in 52 countries.