Attorney-at-law
Leader of the Arbitration Practice
English
Caspian Arbitration Society
Chartered Institute of Arbitrators (CIArb)
Young Austrian Arbitration Practitioners (YAAP)
Young Arbitration Practitioners in Poland (YAPP)
Rising Arbitrators Initiative (RAI)
Arbitration and Meditation Center of Armenia (AMCA)
Permanent Arbitration at the Chamber of Commerce and Industry of Serbia
Young European Federation for Investment Law and Arbitration (EFILA)
Arb | Aut Austrian Arbitration Association
Chambers and Partners 2025
Attorney-at-law and Partner at KKG Legal, where he leads the firm’s Arbitration Practice. He is consistently recognized by leading international legal rankings, including Lexology (formerly Who’s Who Legal), Chambers and Partners, Legal 500, and the Rzeczpospolita daily. His individual distinctions in Benchmark Litigation, Lexology, and Chambers and Partners confirm his expertise and proven effectiveness in resolving complex disputes.
His practice focuses on commercial and civil disputes, helping clients minimize risk and achieve favorable outcomes – whether in the courtroom or through negotiation and mediation.
Represents clients in high-value, multi-jurisdictional litigation and arbitration, and also serves as an arbitrator and tribunal secretary. Has experience with nearly all major arbitration rules in Poland, as well as key international rules, including ICC, SCC, FAI, UNCITRAL, and ad hoc arbitration. He is listed as a recommended arbitrator before several arbitral institutions in Poland and abroad.
Maciej advises and represents clients across a broad range of sectors, including mergers and acquisitions, construction, automotive, banking, life sciences, insurance, rail and rolling stock, real estate, retail, and telecommunications.
Beyond dispute resolution, he supports clients in real estate matters, from lease and sale transactions to investment processes and administrative, judicial, and administrative-court proceedings, including reprivatization disputes. He also conducts internal investigations and compliance audits, and advises on asset tracing and asset recovery.
Maciej holds a PhD in Law from Jagiellonian University (2021), where he defended his dissertation, "Adjudication of Arbitral Jurisdiction," with distinction. He also earned an LL.M. with honors in international arbitration (University of Vienna / City University of Hong Kong) and completed the ICC Advanced Arbitration Academy for Central and Eastern Europe and the SCC Diploma Course. He is a member of the Chartered Institute of Arbitrators (CIArb) in London. He regularly publishes articles and speaks at industry conferences. Through his active presence on LinkedIn, he promotes best practices in arbitration and dispute resolution, helping advance the legal profession. He co-authored the new arbitration rules of the Lewiatan Arbitration Court, where he serves on the Arbitration Committee.
Maciej lectures on arbitration law and civil procedure, and provides professional training in international arbitration and advocacy. As a coach of the Jagiellonian University team competing in the Willem C. Vis Moot and as a mentor with the Moot Alumni Association and the Institute for Transnational Arbitration, he actively supports the next generation of legal professionals.
Attorney-at-law
Leader of the Arbitration Practice
English
Caspian Arbitration Society
Chartered Institute of Arbitrators (CIArb)
Young Austrian Arbitration Practitioners (YAAP)
Young Arbitration Practitioners in Poland (YAPP)
Rising Arbitrators Initiative (RAI)
Arbitration and Meditation Center of Armenia (AMCA)
Permanent Arbitration at the Chamber of Commerce and Industry of Serbia
Young European Federation for Investment Law and Arbitration (EFILA)
Arb | Aut Austrian Arbitration Association
Lexology Index: Arbitration
Wyróżnienie na liście Most Highly Regarded
"Maciej is diligent with a hands-on approach"
SCC Arbitration Institute
Diploma Course for International Arbitrators
International Chamber of Commerce
Advanced Arbitration Academy for Eastern Europe
KKG Legal
partner
Jagiellonian University in Krakow
obtaining the academic degree of doctor of law (defended doctoral thesis with honors)
