Adrian represents clients in domestic and cross-border transactions, in particular local and international companies, private equity/venture funds and growth companies.
In addition Adrian acts as a business angel for several venture capital start-up companies.
Leon is a German litigation and arbitration lawyer based in Düsseldorf, specializing in complex commercial disputes, post-M&A litigation, and antitrust damages claims. He advises and represents clients in the technology, infrastructure and energy sectors, handling high-value cases under German procedural law and major arbitration rules such as ICC, DIS, and VIAC. With extensive experience in cross-border litigation and antitrust law, Leon delivers strategic solutions for clients facing intricate legal and commercial challenges in Germany and internationally.
He has acted as counsel, presiding arbitrator, sole arbitrator, or chairman in more than 300 arbitration proceedings, including ad hoc proceedings and arbitrations under the rules of the leading arbitration institutions.
As counsel, he represents private investors, international corporations, sovereign states, and state-owned enterprises in a range of significant, complex, and often cross-border disputes.
In addition to counsel work and acting as an arbitrator, Siegfried also acts as an expert witness before German courts as well as courts in the United States and the United Kingdom and before regulatory institutions.
His experience includes disputes in the areas of M&A, energy, investment protection, engineering and construction, financing, joint ventures, and intellectual property.
He is admitted to practice as an attorney-at-law in both Germany and New York.
Chambers Global 2024 describes Siegfried as a "star individual" who is "often appointed as arbitrator in complex international arbitrations" and is also "a leading practitioner in the field of investment arbitration" with "extensive experience as an arbitrator in investment law cases".
Siegfried was a member of the Advisory Board of the American Arbitration Association (2009 to 2020) and a member of the Panel of Conciliators of the International Centre for Settlement of Investment Disputes (ICSID) (2011 to 2017). He was a member of the Board of the German Arbitration Institute (DIS) (2012 to 2022) and has been a member of the DIS Council (since 2022). He was also Chairman of the Mediation Committee of the International Bar Association (IBA) (2007-2008).
He is co-editor of the German Arbitration Journal (Zeitschrift für Schiedsverfahren (SchiedsVZ)). He regularly lectures and publishes on international arbitration and comparative law. Siegfried is also honorary professor at the Faculty of Law at Heinrich Heine University Düsseldorf, where he has been teaching international commercial arbitration and international civil procedure law for 25 years. Since 2013, he represents the Grand Duchy of Luxembourg as Honorary Consul in North Rhine-Westphalia.
Siegfried Elsing co-founded the German law firm Hölters & Elsing in 1989 and has overseen the merger with Orrick in 2008.
Carsten advises on all sorts of German tax and accounting issues arising for industry clients, financial institutions and private equity funds. Mainly focusing on corporate and real estate transactions and restructurings. He also advises and represents clients with respect to tax field audits and in tax litigation against the fiscal administration and before German fiscal and civil courts. Prior to joining Orrick Carsten completed his legal traineeship in both national and international law firms.
She advises domestic as well as international clients on German and European antitrust and competition law, including mergers, compliance, internal investigations, cartels and abuse of dominance. In addition, Julia advises on foreign direct investment proceedings before the German Federal Ministry of Economic Affairs and Climate Action . Another part of her practice is to provide general corporate counselling.
At the beginning of her career at Orrick, Julia advised national and international clients on complex cross-border mergers and acquisitions, private equity and venture capital investments, so she is experienced in corporate transactions to that extent.
Prior to joining Orrick, Julia worked as research assistant and trainee lawyer for several international law firms in Düsseldorf and Frankfurt.
Karsten represents clients in international arbitrations under all the main arbitral institutions, including the ICC and DIS, frequently acts as sole and party-appointed arbitrator and also represents clients before national courts in Germany with experience in setting aside and enforcement actions.
As a former M&A transactional lawyer Karsten has solid grounding in pre-contractual and contractual negotiations and advises among others, energy producers and distributors, both traditional (oil and gas) and renewables (solar, wind) construction conglomerates, financial institutions, JVs and biotech companies.
Karsten is praised for his "proactive and skillful" approach (Chambers Global) and has been recognized by Best Lawyers in Germany 2020 and Legal 500.
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