Jürgen Detlef Klengel | White & Case LLP International Law Firm, Global Law Practice
Jurgen Detlef Klengel
Jurgen Detlef Klengel

Jürgen Detlef Klengel

Partner, Frankfurt

Jürgen is named as one of Germany’s leading white-collar crime lawyers in Chambers Europe 2014.


Jürgen offers clients comprehensive advice on all aspects of white collar crime and tax offenses.

His deep and extensive knowledge in these areas is grounded in his many years' experience dealing with white collar and tax offense cases as a public prosecutor.

Jürgen's first-hand enforcement experience helps him to support clients through all phases of investigations, from preliminary proceedings through to complex national and international cases relating to issues such as corruption, corporate espionage, missing trader fraud, price fixing and environmental offenses.

Jürgen's international knowledge enables him to guide companies, multiple parties or individuals through even the most complex cross-border investigations. He has a significant track record, for example, of advising clients faced with investigations by US authorities such as the Securities and Exchange Commission, the Department of Justice and the Office of Foreign Assets Control. He also offers dependable advice on US sanctions, embargo and Foreign Corrupt Practices Act issues.

Jürgen's highly focused and thorough approach has led to him being called on to head up fraud investigations and internal investigations within companies. These matters are often multi-jurisdictional and relate to international bribery, embezzlement or serious compliance breaches. Offering clear and pragmatic advice, Jürgen also advises and represents clients seeking to recover assets lost due to criminal offenses.

Another area of strength for Jürgen is helping companies to ensure that they have fulfilled their required compliance measures, and to implement the respective guidelines and structures. He places particular emphasis on preventive advice, so that clients can avoid costly and unnecessary criminal and tax offense charges by preemptively identifying and eliminating culpable behavior.

Jürgen is also able to offer clients the benefit of his considerable experience of implementing and optimizing group-wide whistle-blower and ombudsman systems.

Bars and Courts

  • Rechtsanwalt


  • Second State Exam, Higher Regional Court of Frankfurt am Main
  • First State Exam, Johannes Gutenberg-University Mainz


  • German
  • English


German industrial group, 2014 – ongoing

Jürgen advised a leading German company group for large engines, propulsion systems and distributed energy systems on compliance issues in connection with international anti-corruption law and German Stock Corporation law, as well as tort litigation.

German bank, 2014

Jürgen advised a leading German bank to help them avoid compliance and fraud misconduct.

Leading restoration company, 2014

Jürgen advised the adversely affected party in a corruption and money-laundering matter with possible ties to organized crime.

Oil and gas contractor, 2014 – ongoing

Jürgen advised a leading European oil and gas contractor regarding foreign trade law, EU sanctions and embargo issues.

German bank and shareholders, 2014

Jürgen advised a German bank and its shareholders regarding possible infringements against EU and US sanctions, FATCA regulations and money laundering.

German industrial group, 2014 – ongoing

Jürgen advised a German, internationally-operating group regarding missing trader fraud.

Metal construction company, 2014 – ongoing

Jürgen advised a German metal construction company as the adversely affected party regarding industrial espionage and the disclosure of business and trade secrets.

German multinational automotive corporation, 2014 – ongoing

Jürgen advised and represented a German multinational automotive corporation as the injured party in corruption investigations and related negotiations as well as tort litigation.

US car manufacturer subsidiary, 2014

Jürgen conducted internal investigations at the German subsidiary of a US car manufacturer, in response to investigation proceedings conducted by the SEC and the DOJ related to suspected corruptive practices in Eastern Europe.

Global Research Company, 2013

Jürgen represented a world-leading research company as the adversely affected party in relation to a management misconduct case, and provided advice on corporate measures and insurance embargoes (OFAC). Jürgen also advised on compliance issues in connection with embargo regulations and foreign trade law.


  • To the classification of the results of an internal investigation as defense counsel documents in the sense of Section 97, 148 of the German Code Of Criminal Procedure, NStZ 2016, 383 et seqq., (Zur Einstufung der Ergebnisse einer "Internal Investigation" als Verteidigungsunterlagen im Sinne der §§ 97, 148 StPO) (co-author Christoph Buchert)
  • Self-indictment in German foreign trade law (Die Selbstanzeige im Außenwirtschaftsrecht), ZWH, Issue 10, 2014, pp. 369–376, 2014, (co-author with Andreas Raschke)
  • Handling stolen data – on the necessity of introducing a new offense, ZRP, Issue 1, pp. 16–19, 2013, (co-author with Tobias Gans)
  • Internal investigations and the right to silence for corporate employees, BB, Issue 16, p. 7, 2011, (co-author with Clemens A. Müller)
  • Criminal Compliance in response to the UK Bribery Act, HRRS, p. 22 et seqq., 2011, (co-author with Stefanie Dymek)
  • The Role of Counsels for Witnesses in German Criminal Proceedings, NJW, p. 23 et seqq., 2011, (co-author with Clemens A. Müller)
  • The new UK Bribery Act – pitfalls for internationally operating companies, DB, p. M 18, 2010, (Der neue Bribery Act des Vereinigten Königreichs – Fallstricke für international tätige Unternehmen)
  • Internal Investigations – typical legal and practical problems, CCZ, No. 3., pp. 81–87, 2009, (Internal Investigations – typische Rechts- und Praxisprobleme unternehmensinterner Ermittlungen) (co-author with Ole Mückenberger)
  • The definitional element of ‘competition’ in Sec. 299 StGB and the financial loss in cases of provision or Kick-back agreements, RRS, Issue 1, p. 52 et seqq., 2007, (Zum "strafrechtlichen" Wettbewerbsbegriff des § 299 StGB und zum Vermögensnachteil des Geschäftsherren bei der Vereinbarung von Provisionen bzw, "Kick-backs") (co-author with Markus Rübenstahl)
  • The Tax Amnesty Disclosure Act – A Description of Tax Amnesty from the Advisory Perspective, Steuerberater, No. 3, p. 105 et seqq., 2004, (Das Gesetz über die strafbefreiende Erklärung – Eine erläuternde Darstellung der Steueramnestie aus Beratersicht) (co-author with Ole Mückenberger)

Awards & Recognition

Leading Practitioner, Who's Who Legal: Investigations 2016

Highly Recommended Lawyer, JUVE 2015/2016

White Collar Crime; Compliance Audits and Investigations

Highly Recommended Lawyer, Best Lawyers/Handelsblatt 2015

Criminal Defense

Leading Lawyer (Band 2), Chambers Europe 2014

Dispute Resolution, White Collar Crime, Corporate Advisory – Germany

Leading Lawyer, The Legal 500, A Selection of German Economic Lawyers, 2014

White Collar Crime