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lawyer Timothy J Hennessy in a suit smiling

Timothy J. Hennessy


Timothy J. Hennessy


Mr. Hennessy joined the firm in 2008. Mr. Hennessy practices civil litigation on behalf of Indian tribes before federal, state, and tribal courts and federal and state agencies, on a range of matters that include tribal gaming, tribal/state/federal regulatory and taxing jurisdiction, tribal governance, federal administrative law, tribal land claims, tribal per capita distributions, contract enforcement and fraud claims. He has advised tribal tort boards and employment review panels, and drafted legislation and policies for tribal government clients. Mr. Hennessy leads the firm's appellate litigation team.

Legal Authorship:

  • New York Legislature Attaints Con Ed: New Significance for the Protection from Bills of Attainder, 37 U.C. Davis L. Rev. 641 (2003)


  • State of California

  • U.S. District Courts: Eastern Dist. California, Northern Dist. California

  • Southern Dist. California, Central Dist. California, Dist. of Columbia

  • U.S. Circuit Courts of Appeal: Second Circuit, Eighth Circuit, Ninth Circuit

  • Federal Circuit

  • U.S. Tax Court

  • Flandreau Santee Sioux Tribal Court

  • Fort Berthold District Court: United States Supreme Court


  • Pomona College (BA, 1997)

  • King Hall School of Law, University of California, Davis (JD, 2004)

Prior Legal Experience

  • Associate Attorney, Law Office of Jeffrey Ochrach, Roseville, California, 2007-2008

  • Associate attorney, Jaramillo & Borcyckowski LLP, Sacramento, California, 2005-2007

a tree with leaves in California


Flandreau Santee Sioux Tribe v. Haeder, 938 F.3d 941 (8th Cir. 2019)

Flandreau Santee Sioux Tribe v. Noem, 938 F.3d 928 (8th Cir. 2019)

Flandreau Santee Sioux Tribe v. Bettor Racing (Flandreau Santee Sioux Tribal Court of Appeals, 2017)

Osceola Blackwood Ivory Gaming v. Picayune Rancheria of Chukchansi Indians, 292 F.Supp.3d 1205 (E.D. Cal. 2017)

Bettor Racing Inc. v. National Indian Gaming Commission, 812 F.3d 648 (8th Cir. 2016)

Shinnecock Indian Nation v. United States, 782 F.3d 1345 (Fed. Cir. 2015)

Cloverdale Rancheria of Pomo Indians v. Jewell, 593 Fed.Appx. 606 (9th Cir. 2014)

Cachil Dehe Band of Wintun Indians of Colusa Indian Community v. California, 618 F.3d 1066 (9th Cir. 2010)