Our roots

Mazars bears the name of its original founder, Robert Mazars, who started its practice near Rouen, in Western France, in 1945. The firm quickly grew to establish itself as a highly reputable practice, rapidly acquiring new clients and becoming well-known for its focus on technical excellence and quality of service.


From its humble beginning to the international Group that it is today, Mazars has always remained true to its founder’s spirit and values of deep ethical commitment, responsibility and belief that technical excellence is the key to success.
It is based upon these values that the generations which inherited Mazars managed to grow the organisation, through the co-optation of new partners, in Europe and around the world, and through mergers with firms that share the same values, vision, and objectives. 
That well known national firms like Weiser in the USA, Neville Russell in the UK or Paardekooper Hoffman in The Netherlands, elected to join the partnership is proof that the Mazars way has indeed been an attractive and effective model. 
Now operating via its integrated partnership in 89  countries and territories across the globe, with over 24,000  professionals, Mazars has become a fully-fledged global player.


  • 1945: Robert Mazars starts his accountancy practice near Rouen, France.
  • 1965: The "Cabinet Robert Mazars" limited liability company is created on January 1.
  • 1973: The company moves its audit team to Paris.
  • 1975: Mazars opens its first offices outside of France, in Germany and Spain.
  • 1985: Robert Mazars chooses to resign. Patrick de Cambourg becomes Chairman of Mazars.
  • 1995: Mazars merges with Guérard Viala. The merger also marks the creation of the Mazars CARL partnership, which gives the partners in each of the two firms the chance to be fully associated as equals in the development of the new organisation.
  • 1998: Mazars merges with Neville Russell, one of Britain’s leading independent firms.
  • 1999: Mazars & Guérard choose the brandname “Mazars”.
  • 2000: Mazars merges with Paardekooper Hoffman in The Netherlands. With offices in most European countries, Mazars truly becomes an international organisation. Outside of Europe, Mazars is already present in Latin America - Brazil -, China and in a several African countries. The organisation also operates in many other countries and territories, through correspondence agreements.
  • 2003-2007: Mazars speeds up its international development, with new offices in Eastern Europe (including Russia), China, India and the Asia-Pacific area, Latin America - Mexico, Brazil, Argentina, Venezuela, Chile,...-, Southern Africa and the Middle East.
  • 2007: Mazars becomes one of the founding members of the Praxity Alliance bringing together over 100 independent firms in 75 countries and territories.
  • 2011: Philippe Castagnac becomes CEO of the Group.
  • 2015: Mazars merges its German practice with Roever Broenner Susat (RBS) and celebrates the 20th anniversary of its international integrated partnership.
  • 2016: The Chinese firm ZhongShen ZhongHuan joins Mazars’ integrated partnership. Hervé Hélias becomes CEO of the Group.
  • 2018: Mazars and its correspondents operate throughout 102 countries and territories.  89 of these countries and territories are part of Mazars’ international integrated partnership and 14 are Mazars’ correspondents.