Mark McLennan is a litigation associate in the International Dispute Resolution Group.

Mr. McLennan joined Debevoise in 2019. Prior to joining the firm, Mr. McLennan worked in the international arbitration group in the London office of a large multinational law firm.

Mr. McLennan’s practice focus on high-stakes construction and oil & gas matters advising clients on arbitrations governed by major institutional rules. He has represented infrastructure clients in complex, high-value disputes with commercial entities and governments. Mr. McLennan has in-depth knowledge of the industry, and understands the challenges that infrastructure investors and companies routinely face across all sectors.

Mr. McLennan received his J.D. from the University of Sydney in 2013 and his LL.M. from the London School of Economics and Political Science in 2015. He received his B.A. from the University of Sydney in 2010.

Mr. McLennan was admitted to practice law in New York and Texas in 2020. He is also licensed to practice as a solicitor in New South Wales.


  • London School of Economics and Political Science, 2015, Master of Laws
  • University of Sydney, 2013, J.D.
  • University of Sydney, 2010, B.A.

Bar Admissions

  • New South Wales
  • New York
  • Texas