Mușat & Asociații este întotdeauna cu un pas înainte în ceea ce privește evoluția cadrului legislativ și a mediului de afaceri, anticipând nevoile clienților și acționând că un deschizător de drumuri în domeniu.

Practice areas

Criminal Law/White Collar Crime
Corporate & Commercial Law
Litigation & Arbitration

Stefan Diaconescu is a reputed criminal law practitioner, with over 11 years of legal experience in this field, during which he has provided complex legal assistance and representation service to numerous legal entities and individuals - especially business men and politicians - before criminal investigation authorities and national courts of law, of all levels.

Stefan has achieved remarkable results in high profile projects that included assistance (compliance, regulatory and internal investigations) to companies in order to avoid or prevent criminal prosecution, in matters which have included corruption crimes, economic crimes, aviation law, energy law, intellectual property and public procurement.

Stefan’s accomplishments have lead him to winning the Rising Star title for 2021, awarded by Euromoney’s Legal Media Group, part of IFLR1000, as well as the Top Attorney award in Criminal law at the 2022 Top Lawyers awards organized by Finmedia and Piata Financiara magazine.

  • Studies
  • Spoken languages
  • Qualifications & Career
  • Mandates
  • Affiliations
  • Awards
  • Appreciations
  • Legal experience: 11 years
  • Legal experience within Mușat & Asociații: 11 years
  • Partner: 2024 – to date
  • Managing Associate: 2021 – 2023
  • Senior Associate: 2016 – 2020
  • Associate: 2013 – 2016
  • (2015) – Fully qualified lawyer, Bucharest Bar
  • (2013) – Admitted as lawyer, Bucharest Bar
(2013) – Master’s Degree in Judicial Career, University of Bucharest, Faculty of Law
(2012) – LL.B, Alexandru Ioan Cuza University of Iași, Faculty of Law
  • English, CAE (A+)
  • German
  • Romanian

Successfully represented the leading company in the oil refinery business (Romania) in a highly complex criminal case, involving tax evasion, money laundering, asset freezing measures being imposed on the goods and stocks of the company, and with an estimated prejudice in excess of EUR 700 million.

Assisted and represented an international producer of household goods in a case involving employee’s criminal actions during a strike declared in one of their subsidiaries.

Provided legal assistance and representation for an important Romanian Bank, in relation to a complex criminal investigation with an estimated prejudice in excess of EUR 70 million.

Assisted and represented the leading player on the Romanian energy and gas market, in various complex criminal files, both in front of the criminal investigation authorities and of the Criminal Courts of Law, involving also complex settlements of damages claims.

Represented a Romanian aviation authority in the criminal file investigated by the Prosecutors’ Office attached to the High Court of Cassation and Justice, in relation to an airflight accident which took place in Romania.

Represented the global wiring systems and cable technology leader, in complex a criminal file in front of the criminal investigation authorities, involving also complex settlements of damage claims in excess of EUR 40 million.

Provided legal assistance and representation for the largest Romanian retailer (affiliate of a leading European commercial corporation), in connection with a complex criminal file arisen from corruption charges in relation to a large commercial and real estate transaction.

Assisted and represented a national distributor of trucks and one of the most important automobile dealers, in various complex criminal files in front of the criminal investigation authorities, involving tax evasion.

  • Bucharest Bar and Romanian Bar Association - 2013
  • Rising Star – White Collar Crime, Legal 500, 2024
  • Awarded Top Lawyer in Criminal Law / White Collar Crime at the Top Lawyer Awards Gala 2022, organized by Finmedia and Financial Market magazine
  • Rising Star Award Romania – Rising Stars Awards EMEA 2021 (Euromoney’s Legal Media Group, part of the prestigious IFLR1000)
„Ștefan Diaconescu is the best criminal attorney we have worked with, both from Mușat and also from other law firms in this sector, he really is a star in criminal litigation. Ștefan leads a team of hard-working and dedicated professionals and has always had an answer to any question we have raised.”
Legal 500
„Ștefan Diaconescu, everyone should remember the name. He is the best criminal law attorney we have had the pleasure of working with. His knowledge of the sector and the quality of the legal services which he has delivered have been excellent, handling several internal investigations from start to finish and providing the best recommendations.”
Legal 500
”Stefan Diaconescu is one of the most remarkable criminal defense attorneys we have collaborated with, having the ability to achieve amazing results in highly complex criminal cases. His drafting skills and ability to be calm under any circumstances makes him our go-to lawyer in criminal cases.”
Legal 500
„Mușat & Asociații is our trusted adviser for any sensitive issue, handling all our internal investigations and litigations with top marks and obtaining positive results. It’s no wonder why they have been on the market for over 30 years and Ștefan Diaconescu definitely stands out due to his experience, his strong knowledge of procedures and regulations, but also his talent in coordinating the white-collar team with ease and always taking care of the client.”
Legal 500
„I work with Stefan Diaconescu. He has very deep knowledge in criminal law, he is attentive to details and he always responds very promptly to the client’s needs. Stefan proved to be a reliable lawyer, his advice was always very accurate and led to a favorable solution to the problem.”
Legal 500
”I work with Stefan Diaconescu and he is a trustworthy, reliable, experienced, knowledgeable and hard working lawyer.”
Legal 500