Mr. Mark C. Fleming
Wilmer Cutler Pickering Hale and Dorr LLP
60 State Street
Boston, MA 02109

Phone    (617) 526-6909
Fax         (617) 526-5000

Type of Case: Civil and Criminal
Admitted to practice:
Supreme Court
1st Circuit, 2nd Circuit, 3rd Circuit, 6th Circuit, 8th Circuit, 9th Circuit, 10th Circuit, D.C., Federal

Mark Fleming is vice-chair of WilmerHale's Appellate and Supreme Court Litigation Practice. Mr. Fleming has worked on more than 250 appellate cases and personally presented oral argument in 56 of them, including seven before the Supreme Court of the United States. He has also argued before the First, Second, Third, Eighth, Ninth, Tenth, District of Columbia, and Federal Circuits and the Massachusetts Supreme Judicial Court and Appeals Court. Mr. Fleming's prior experience includes clerkships with the Honorable David H. Souter of the Supreme Court of the United States, the Honorable Michael Boudin of the US Court of Appeals for the First Circuit, and the Honorable John C. Major of the Supreme Court of Canada. Mr. Fleming also served as an associate legal officer in the Appeals Chamber of the International Criminal Tribunal for the former Yugoslavia.


  • J.D. magna cum laude, Harvard Law School, 1997. Bachelor of Arts (Hons.), English and German, University of King's College/Dalhousie University, 1994.

Practice Focus:

  • Appellate litigation
  • patent law
  • constitutional law
  • immigration
  • securities
  • commercial litigation
  • international law
  • arbitration

Representative Cases:

  • Mathis v. United States, 136 U.S. 2243 (2016)
  • Mata v. Lynch, 135 S. Ct. 2150 (2015)
  • Judulang v. Holder, 132 S. Ct. 476 (2011)
  • Board of Trustees of the Leland Stanford Junior University v. Roche Molecular Systems, Inc., 563 U.S. 776 (2011)
  • Nemirovsky v. Daikin North America, Inc., 488 Mass. 712 (2021)
  • L.S. v., Inc., 954 F.3d 110 (2d Cir. 2020)
  • 01 Communique Laboratory, Inc. v. Citrix Online, LLC, 889 F.3d 735 (Fed. Cir. 2018)
  • Lenox Maclaren Surgical Corp. v. Medtronic, Inc., 847 F.3d 1221 (10th Cir. 2017)
  • Nike, Inc. v. Adidas AG, 812 F.3d 1326 (Fed. Cir. 2016)
  • Almanza-Arenas v. Lynch, 809 F.3d 515 (9th Cir. 2015) (en banc)
  • White v. Hartigan, 464 Mass. 400 (2013)
  • Shum v. Intel Corp., 629 F.3d 1360 (Fed. Cir. 2010)
  • Brown v. Medtronic, Inc., 628 F.3d 451 (8th Cir. 2010)
  • Bensayah v. Obama, 610 F.3d 718 (D.C. Cir. 2010)
  • In re Plassein International Corp. (Brandt v. B.A. Capital Co. LP), 590 F.3d 252 (3d Cir. 2009)
  • Brewster Wallcovering Co. v. Blue Mountain Wallcoverings, Inc., 68 Mass. App. Ct. 587 (2007)

Nature of Firm's Practice:

  • Global law firm with market-leading strengths in Litigation/Controversy, Transactional, Regulatory, Securities, and Intellectual Property.