Jean-Paul Mazoyer began his career at Crédit Lyonnais Suisse in 1988, then moved to Accenture, where from 1989 to 1996 he carried out various advisory missions to banks, including Crédit Agricole. In 1996, he joined the private client Marketing Department of Caisse Nationale de Crédit Agricole. In 1998, he became Director of Marketing and Communication for Crédit Agricole Ile-de-France. In 2002, he was appointed Head of Credit and Risk.
Jean-Paul Mazoyer joined Calyon in 2004 as Deputy Head of the International Network in charge of coordinating and facilitating all of the support functions.
In 2007, he became Head of Support and Development Functions at Crédit Agricole Asset Management (marketing, commercial support and international network). In 2010, Jean-Paul Mazoyer was Deputy CEO in charge of Support and Development functions at Amundi.
In 2013, he became Head of Group IT & Process Development at Crédit Agricole SA
In early 2016, Jean-Paul Mazoyer was appointed CEO of the Crédit Agricole Pyrénées Gascogne Regional Bank.