• ● American Bar Association (ABA)
• ● American Arbitration Association (ABA) (Member – Board of Directors)
• ● Association Suisse de l´arbitrage (ASA)
• ● Deutscher Anwaltverein e.V. (DAV)
• ● Deutsche Institution für Schiedsgerichtsbarkeit e.V. (DIS)
• ● International Bar Association (IBA) (Chair - Mediation 2007/2008)
• ● Internationalen Zentrums zur Beilegung von Investitionsstreitigkeiten (ICSID) - Mitglied im Schlichterverzeichnis
  
• ● London Court of International Arbitration (LCIA)
• ● AIJA Association Internationale des Jeunes Avocats (AIJA) (Präsident 1990/1991)

Listings:

• ● P LC 2011/2012 and 2010/2011: Arbitration Cross-border Handbook (Germany)
• ● Chambers Global 2011: Arbitration (International): Most in Demand Arbitrators (Band 1, Europe-wide) and Dispite Resolution: Most in Demand Arbitrators (Band 1, Germany) and 2010, Most in Demand Arbitrators
• ● Handelsblatt Legal Success, Best Lawyers 2011(Corporate/Arbitration and Mediation/Conducting Court Procedures) and 2010 Recommended (Litigation/ Arbitration and Mediation), German publication
• ● Legal 500 2011: Dispute Resolution (3rd tier firm)
• ● Legal Experts 2011: Europe, Middle East & Africa – Corporate M&A and Dispute Resolution (Germany)
• ● Who's Who Legal 2011: The International Who's Who of Business Lawyers/Arbitration and Commercial Litigation
• ● PLC 2009/2010 Cross-border Handbook: Empfehlung – Arbitration, Counsel to Arbitration and M&A
• ● Euromoney 2009, The Best of the Best - Commercial Arbitration
• ● Chambers Europe 2008/2009, Leaders in their field: Corporate, M&A, Dispute Resolution
• ● Honorarprofessor, Heinrich-Heine-Universität, Düsseldorf (seit 2007)