After studying law at the Université Pierre Mendès France (Grenoble II) and a military service at the 27th Mountain Infantry Division, Christophe Cottet-Bretonnier succeeded the competition of the CRFPA of Grenoble in 1998 and obtained his CAPA the following year After the classical achievement of the year of training at the school of lawyers.
He swore an oath in 1999 in Lyon and began his career as a lawyer in Montreal (Canada) within the Intellectual Property Department of the Ogilvy-Renault firm. At that time he published reference articles in the right to the image. Back in France in 2000, he joined the bar of Lyon and then opened in 2003 a second office in Annemasse (Haute-Savoie). Surrounded by his collaborators, he refocused his activity mainly in criminal law, labour law and family law and intervened in numerous media trials (Neveux, Levy, Manissieux robbery, Nallet, Tricotage Cevenol, Foundation Brigitte Bardot, murder of the retiree of Armoy...).lgdsQUAGE,
In 2006, Christophe Cottet-Bretonnier was a lawyer of the civil party in the Fauviau case before the Criminal Court in a case considered the most serious ever judged in amateur sport1, with the presence of numerous French and foreign media during the trial week2, 3.
In 2009, the Toni Musulin fund conveyor, following its spectacular flight of 11.6 million euros4 and his surrender to Monaco, chooses it to ensure its defense (video , )which will last 4 years (video . Christophe Cottet-Bretonnier will even play his own role in the film )11.65, released on April 3, 2013, which traces the affair to the cinema and where François Cluzet performs Toni Musulin. In agreement with his client, he speaks at length about the shadow areas of one of the biggest heists of the century6 in a 26-minute documentary, "The Musulin Mystery", DVD bonus movie (video . )
In 2015, at only 44 years, his career and his work earned him to be named Knight in the National Order of Merit by Presidential Decree on the proposal of the Minister of Justice7, 8 .
On October 1, 2017, Maître Eddy Navarrete joined him as a partner with the SCP Cottet-Bretonnier Navarrete, including offices in Lyon, Paris, Annemasse and Oyonnax.