Court of Appeals

Division One


Professional Experience:

Judge, Arizona Court of Appeals, Division One (2012-present)

Judge, Arizona Superior Court, Maricopa County (2007-2012) Criminal (2010-2012) and Juvenile (2007-2012) Rotations; Elected Member Judicial Executive Committee (2007-2012)

Partner, Perkins Coie Brown & Bain P.A. (2004-2007) Phoenix Office Management Committee Member (2005-2007)

Partner (1996-2004), Hiring Partner (1999-2004) and Associate (1992-1996), Brown & Bain P.A., Phoenix

Law Clerk, Arizona Supreme Court (1992-1993)

Associate, Arnold & Porter, Washington D.C. (1990-1992)

Law Clerk, United States District Court, Northern District of Iowa (1988-1990)


University of Iowa College of Law (J.D. 1988)
Graduated Order of the Coif with High Distinction
Note & Comment Editor, Iowa Law Review

Iowa State University (B.S. 1984)

Harry S. Truman Memorial Scholar and Cardinal Key Honor Society


Court Admissions:


United States Supreme Court; United States Courts of Appeal for the Ninth and District of Columbia Circuits; United States District Courts for the Districts of Arizona and the District of Columbia; Supreme Courts of Arizona, Illinois and Iowa; District of Columbia Court of Appeals

Selected Bar and Community Service:

American Bar Association Presidential Appointee to Judges’ Advisory Committee, Standing Committee on Ethics and Professional Responsibility (2007-2010); Judicial Division Ethics and Professionalism Committee Member (2009-present) and Technology Committee Chair (2014-present); Arizona Delegate to National Conference of State Trial Judges (2008-2012); Litigation Section Co-Editor Pretrial Practice & Discovery Newsletter (2006-2010)

American Bar Foundation Member (2005-present)

American Law Institute Member (2003-present) Advisor Restatement of the Law (Third) of Torts: Liability for Economic Loss (2005-present); Members Consultative Groups Principles of the Law of Nonprofit Organizations (2007-present); Principles of Government Ethics (2011-present) and Restatement of the Law (Third) Restitution and Unjust Enrichment (2003-2011)

Arizona Uniform State Laws Commissioner and delegate to the National Conference on Commissioners on Uniform State Laws (2012-present)

The Sedona Conference Judicial Advisory Board (2013-present)

Arizona Supreme Court Co-Chair Advisory Committee on Rules of Evidence (2012-present); Member Committee on the Review of Supreme Court Rules Governing Professional Conduct and the Practice of Law (2014-present); Member Ad Hoc Committee on Rules of Evidence (2010-2012);  Arizona Judicial Conference Planning Committee Member (2012–2013); Superior Court New Judge Orientation Co-Chair (2011-2012); Committee on Judicial Education and Training Member (2010-2012); Reviewer Juvenile and Juvenile Hearing Officer Bench Books (2010-2011).

State Bar of Arizona Committee on the Rules of Professional Conduct Member (2006-present);Co-Chair Appellate Handbook Committee/Co-Editor Arizona Appellate Handbook (2012-present); Civil Practice and Procedure Committee Chair (2002-2006), Vice Chair (2001-2002) and Member (1997-2006); Fee Arbitration Committee Chair (1997-2002) and Member (1994-2007)

Thurgood Marshall Inn of Court President (2013-2014) and Member (2010-present)

Rotary International, Phoenix Rotary 100 Club Member (2010-present)

American Red Cross National Leadership Council Member (2009-2010); National Resolutions Committee Vice Chair (2006-2007) and Member (2005-2007); Western Service Area Council Member (2004-2008); Grand Canyon Chapter Board Chair (2002-2004), Executive Committee (2001-2004) and Member (1999-2004)

Valley Leadership Class XXIII (2001-02)

Publications and Teaching Experience:

Kirchmeier & Thumma, “Scaling the Lexicon Fortress: The United States Supreme Court’s Use of Dictionaries in the Twenty-First Century,” 94 Marquette L. Rev. 77 (2011).

Ballinger & Thumma, “The Continuing Evolution of Arizona’s Economic Loss Rule,” 39 Ariz. St. L J. 353 (2007).

Ballinger & Thumma, “The History, Evolution and Implications of Arizona’s Economic Loss Rule,” 34 Ariz. St. L J. 491 (2002).

Thumma & Kirchmeier, “The Lexicon Remains a Fortress: An Update,” 5 Green Bag 2d 51 (2001).

Thumma & Kirchmeier, “The Lexicon Has Become a Fortress: The United States Supreme Court’s Use of Dictionaries,” 47 Buff. L. Rev. 227 (1999).

Thumma & Jackson, “The History of Electronic Mail in Litigation,” 16 Santa Clara Computer & High Tech. L.J. 1 (1999).

Thumma & Dawson, “The Iowa Equal Access to Justice Act: Is Recovery Available?” 39 Drake L. Rev. 431 (1988-89).

Thumma, Comment, “The Domestic Industry Definition in Value-Added Agricultural Investigations: Why all the Attention?” 12 N.C.J. Int'l Law & Com. Reg. 249 (1987).

Author or co-author of more than 35 other articles on law-related topics.

Adjunct Professor, Civil Remedies, Arizona State University, College of Law (Spring 2000)

Presenter at more than 170 national, state and local seminars on various law-related topics including evidence, experts, ethics, electronic discovery, damages and deposition skills.

Selected Awards:

Honorary Chair, American Bar Association, Litigation Section Annual Conference (2014)

Lifetime Fellow, Arizona Foundation for Legal Services & Education (2011)

American Bar Association Litigation Section Outstanding Subcommittee Chair (2010)

American Red Cross National and Regional Leadership Awards (2008)

American Red Cross National 125th Anniversary Gala Honoree (2006)

Speaker, Presentation of the Portrait of the Honorable David R. Hansen, Senior United States Circuit Judge, Eighth Circuit Court of Appeals, Cedar Rapids, Iowa (transcribed at 433 F.3d XXXI-LIV)

The Business Journal Class of 2002 “Forty Under 40” Honoree