Building on over 20 years’ experience in complex criminal proceedings, MARSIGNY AVOCATS advises on high-stake criminal cases on behalf of individuals, companies, public and State institutions and their executives.

Thanks to a network of correspondent law firms in a large number of countries, MARSIGNY AVOCATS also provides assistance to its clients in the scope of international proceedings in which are involved the main enforcement agencies and regulatory bodies.

As an independent law firm, MARSIGNY AVOCATS is therefore fully committed to definition and implementation of its clients’ defence strategy.

MARSIGNY AVOCATS is a close-knit and reactive team of six highly specialized lawyers, who speak six languages and are highly committed to made-to-measure criminal defence.

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MARSIGNY AVOCATS provides assistance to its clients in all areas of criminal law, from the management of criminal risk within companies, to all stages of the criminal process:

  • Investigation;
  • Police custody;
  • Preliminary inquiry;
  • Judgment hearing.

MARSIGNY AVOCATS has specific expertise in business criminal law and in financially and politically sensitive cases and high-profile cases.

MARSIGNY AVOCATS specifically advises on behalf of individuals, legal entities or their directors in the scope of cases relating to

  • National or international corruption, misconduct in public office, favouritism, influence peddling, misappropriation of public funds and other probity offences;
  • Criminal proceedings further to major disasters (Concorde plane crash, Brétigny-sur-Orge train crash);
  • Money laundering, tax evasion money laundering and tax evasion;
  • Fraud and unfair commercial practices;
  • Securities and company criminal law (insider trading, misuse of corporate assets, bankruptcy, etc.);
  • Employment criminal law (illegal employment, workplace accidents and breach of health and safety regulations);
  • Media criminal law.

The firm also regularly advises on French or international asset seizure and freezing proceedings and on extradition proceedings.

The law firm also advises on general criminal law cases before all criminal courts.


Emmanuel Marsigny, avocat fondateur du cabinet Marsigny Avocats
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Emmanuel Marsigny


Emmanuel Marsigny formed MARSIGNY AVOCATS in October 2013, after having been a partner at Metzner Associas, which he co-founded in 1998.

Admitted to the Paris Bar since 1995, member of the International Bar Association, he is a reputed and appreciated specialist in criminal defence, handling cases covering all aspects of general criminal law and corporate criminal law (finance, securities, tax, environment, economic or political), with notable experience in sensitive and/or high-profile cases. He also specializes in extradition matters.

In recent years, Emmanuel Marsigny has advised in most part of prominent criminal cases such as the Elf case, fake jobs at the Paris city hall, Angolagate, Furiani stadium disaster, Concorde plane crash, so-called “ill-gotten-gains” case, sale of Compiègne horse racecourse, Concorde gambling circle, Brétigny-sur-Orge train crash, etc…

Emmanuel Marsigny regularly represents clients before the ordinary courts (assize courts, criminal courts and appeal courts) and special courts or independent administrative authorities.


• Post-graduate research program in criminal law and criminal policy in Europe, University of Paris I, Panthéon-Sorbonne, 1995
• Graduate degree in business law, University of Paris I, Panthéon-Sorbonne, 1993
• Graduate degree in judicial careers, University of Paris I, Panthéon-Sorbonne, 1993

Fluent in three languages (French, English, Spanish)

Louis Guesdon, avocat associé du cabinet Marsigny Avocats
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Louis Guesdon


Before becoming a partner at MARSIGNY AVOCATS in January 2016, Louis Guesdon worked as an associate at Metzner Associés from 2010 to 2013, then with MARSIGNY AVOCATS as from 2013. Admitted to the Paris Bar in 2010, Louis Guesdon has taken part over the last six years in a large number of important criminal cases, He is dedicated to the defense of individuals or companies in various areas of criminal law. He mainly focuses on business criminal law cases (corruption and other probity offences, tax law, labor law, misuse of corporate assets, bankruptcy, stock market criminal law…) but also deals with general criminal law cases.


• HEC Paris, Business school, Graduation in 2011
• Post-graduate degree in Business and Tax Law, University of Paris I, Panthéon-Sorbonne, 2007
• Masters degree in Business Law, University of Paris I, Panthéon-Sorbonne, 2006

Fluent in three languages (French, English, Italian, Spanish)



189 boulevard Saint-Germain
75007 PARIS

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