Klain, Bill

William G. Klain

William G. Klain, Commercial Litigation Attorney

Super Lawyers has twice ranked Bill Klain in its "Top 50 Arizona" list, in 2018 and 2022. A Best Lawyers® and Super Lawyers honoree in business litigation, Bill co-chaired the Arizona Supreme Court’s Task Force on the Arizona Rules of Civil Procedure and is past chair of the State Bar’s Civil Practice and Procedure Committee.

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William G. Klain

William G. Klain

William G. Klain, Commercial Litigation Attorney

Super Lawyers has ranked Bill Klain in its "Top 50 Arizona" list in 2018, 2022 and 2023. A Best Lawyers® and Super Lawyers honoree in business litigation, Bill co-chaired the Arizona Supreme Court’s Task Force on the Arizona Rules of Civil Procedure and is past chair of the State Bar’s Civil Practice and Procedure Committee.

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William G. Klain
AV Preeminent - Martindale-Hubbell
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William G. Klain
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Phoenix Magazine Top Lawyer 2022

Arizona commercial litigation and corporate lawyer Bill Klain represents clients in business litigation – including civil matters involving intentional torts and negligence – and in the formation and governance of corporations, limited partnerships and limited liability companies.

For over 25 years, he has successfully helped his clients navigate a wide range of disputes involving:

  • Business divorces and dissolutions
  • Fiduciary breaches
  • Business torts
  • Sales contracts
  • Buy-sell agreements
  • Non-compete, non-solicitation and non-disclosure agreements
  • A variety of other commercial disputes

Bill is a member of the Arizona Judicial Council’s Committee on Superior Court. Previously, he served on the Supreme Court’s Advisory Committee on Rules of Evidence and the Business Court Advisory Committee, which developed Arizona’s Commercial Court.

Firm News: Bill Klain

Practice Areas

Commercial Litigation

Mediation and Arbitration

Business Law

Appellate Law

Honors & Awards

AV-Preeminent® Rating, Martindale-Hubbell®

The Best Lawyers in America®, Commercial Litigation, Bet-the-Company Litigation, 2015-present

Super Lawyers: "Top 50 Arizona," 2018, 2022, 2023; Business Litigation, 2012-present

"Top 100 Lawyers in Arizona for 2023" (Complex Corporate and Commercial Litigation), AZ Business Magazine

"Top Lawyer," Phoenix Magazine, 2022, 2023

"Top 100 Lawyers in Arizona," AZ Business Magazine, 2019

Chief Justice's Outstanding Contribution to the Arizona Courts Award, 2016

State Bar of Arizona "Volunteer of the Month," April 2016

Arizona’s Finest Lawyers (Sustaining Member), 2014-present

State Bar of Arizona “Member of the Year,” 2013

Award of Excellence, Scottsdale Bar Association, 2012

State Bar of Arizona: President’s Award (Contributions to Civil Practice and Procedure), 2008

Professional Memberships and Activities

American Bar Association

State Bar of Arizona: Civil Practice and Procedure Committee (Chair, 2011-2014; member, 2000-present); Ethical Rule 1.15 Task Force; Business Section

Committee on Superior Court, Arizona Judicial Council (State Bar of Arizona Representative)

Adjunct Professor, Civil Pretrial Practice, Sandra Day O’Connor College of Law, Arizona State University, 2018-2022

Commercial Court Practices and Procedure Committee, Maricopa County Superior Court

Civil Study Committee, Maricopa County Superior Court

Coach, Veritas Preparatory Academy Mock Trial Team, 2020-2022

Commercial Court Review Committee, Arizona Supreme Court, 2018

  • More Memberships and Activities

    Advisory Committee on Rules of Evidence, Arizona Supreme Court, 2012-2018


    Committee on Civil Justice Reform, Arizona Supreme Court, 2017


    Task Force on the Arizona Rules of Civil Procedure, Arizona Supreme Court: Co-Chair, 2014-2016


    Business Court Advisory Committee, Arizona Supreme Court, 2015


    Case Management and Trial Setting Task Force, Administrative Office of the Court, 2013


    Committee on Civil Rules of Procedure for Limited Jurisdiction Courts, Arizona Supreme Court, 2011-2012


    State Bar of Colorado


    Scottsdale Bar Association, past president


    Maricopa County Bar Association


    Thurgood Marshall Inn of Court

Articles

“Meet the New Rules, (Not the) Same as the Old Rules ,” Arizona Attorney (State Bar of Arizona), December 2016

"Employee Misuse of Confidential Information," December 2014

"A Long and Winding Road: How We Reached the 2014 Amendments," Arizona Attorney (State Bar of Arizona), February 2014

"Fixing Holes Where the Rain Gets In: Seven Recent Arizona Civil Rule Amendments Dissected," Record Reporter, February 2014

"Restrictive Covenants in Employment Agreements," January 2014

"Customer List: Not Necessarily a Trade Secret," November 2013

"Significant Differences Between Arizona and Federal Civil Procedure," May 2013

"In a Lawsuit Arising from an Online Transaction, Where Should an Unhappy Buyer File Suit?" September 2010

"Much Ado About Cullen: Twombly Not Arizona Law ... for Now, " Arizona Attorney (State Bar of Arizona), December 2009

"Asset Transfers and the Doctrine of Successor Liability," August 2008

Presentations

“Goodbye Peremptory Challenges:  Underlying Rational, Experience to Date, and Strategic Considerations” (seminar co-chair and panelist), State Bar of Arizona “CLE by the Sea,” July 2023

“Sun Tzu and von Clausewitz in the Courtroom: Shaping the Battlefield through Dispositive Motions and Realizing that No Battle Plan Survives First Contact with the Enemy” (seminar co-chair and panelist), State Bar of Arizona “CLE by the Sea,” July 2023

“’Toto, I’ve a Feeling We’re Not in Superior Court Anymore’: Contrasting State and Federal Trial Practice and How to Avoid Losing your Appeal Before it Starts” (seminar co-chair and panelist), State Bar of Arizona “CLE by the Sea,” July 2023

“Civil Practice Update” (panelist), State Bar of Arizona, January 2023

Judicial Conference Advisory Committee on Evidence Rules (panelist), Fall Meeting, 2022

Civil Practice and Procedure Symposium (panelist), State Bar of Arizona, September 2022 

“Complex Civil Litigation and Tier 3 Cases in Commercial Court:  Everything You’ve Always Needed to Know, But Were Afraid to Ask!” (panelist), Maricopa County Bar Association, October 2021

“Where the Rubber Meets the Road: How the 2017 and 2018 Civil Rules Changes Are Impacting Litigation” (panelist), State Bar of Arizona, January 2019

“War Stories: Senior Litigators' Tales from the Trenches and Lessons Learned” (co-presenter), Maricopa County Bar Association Litigation and Real Estate Sections, December 2018

“2018 Civil Practice and Procedure Symposium” (seminar co-chair and panelist) State Bar of Arizona, April 2018

“Proportionality Takes Center Stage: The 2018 Revisions to the Arizona Rules of Civil Procedure” (co-presenter), Arizona Attorney General’s Office, Maricopa County Attorney’s Office, and Sandra Day O’Connor Inn of Court, Spring 2018

“2018 Civil Justice Reforms: Case Management, ESI, and More” (panelist), State Bar of Arizona, January 2018

“Meet the New Rules: The Restyled Arizona Rules of Civil Procedure” (seminar chair and panelist), State Bar of Arizona “CLE by the Sea,” July 2017

“Better, Faster, Cheaper: Case Management Reforms Coming to a Court Near You” (panelist), State Bar of Arizona “CLE by the Sea,” July 2017

“The Changing Federal Rules: Proportionality and More” (seminar chair and panelist), State Bar of Arizona “CLE by the Sea,” July 2017

“Under New Management: Case Management Reform Rule Changes” (panelist), State Bar of Arizona Convention, June 2017

"Evidence Law Update" (panelist), State Bar of Arizona Convention, June 2015-2018

“2017 Civil Rules Changes: What Every Litigator Needs to Know” (co-presenter), Maricopa County Bar Association, February 2017

“A Time of Change: The 2017 ARCP Revisions” (panelist), Scottsdale Bar Association, February 2017

“2017 Civil Rules Update” (co-presenter), Arizona Attorney General’s Office, February 2017

“Evidence Law Update Reprise” (panelist), State Bar of Arizona, February 2017

“A Time of Change: The 2017 ARCP Revisions, and Proposals for 2018” (faculty member), State Bar of Arizona, January 2016

"Civil Law Updates" (faculty member), Arizona Judicial Conference, June 2016

“Where We’re Going, We Still Need Rules: Back to the Future in Civil Litigation” (panelist), State Bar of Arizona Convention, June 2016

“Sea Changes in the Federal and Arizona Rules of Civil procedure: The Winter 2016 Civil Rules Update” (panelist), State Bar of Arizona, February 2016

“2015 Amendments to the Arizona and Federal Rules of Civil Procedure,” Chair and Co-Presenter, Arizona Attorney General’s Office, January 2016

“Civil Litigation Rules and Case Law Update” (panelist), State Bar of Arizona Convention, June 2015

“2015 Civil Practice and Procedure Symposium,” State Bar of Arizona, Seminar Chair and Panelist, April 2015

“The Rules They Are A-Changin’ (Again): 2015 Arizona Civil Rules Update,” State Bar of Arizona, Panelist, January 2015

  • More Presentations

    “Civil Rules Update,” Scottsdale Bar Association, December 2014


    “The Rules of Civil Procedure: An Examination of the Discovery and Trial Rules in Justice, State and Federal Court," Maricopa County Bar Association, 2014 Arizona Paralegal Conference, Faculty Member, October 2014


    “Annual Bench and Bar Luncheon,” State Bar of Arizona, Seminar Chair, 2012-2014


    “Integrating Technology into Pre-Trial Preparation,” State Bar of Arizona CLE by the Sea, Faculty Member, July 2014


    “The Rules They Are A-Changin’ (Again): 2014 Arizona Civil Rules Update,” State Bar of Arizona, Seminar Chair and Co-Presenter, January 2014


    “They’re Changing Again?! 2014 Arizona Civil Rules Update,” Construction Law Section of the State Bar of Arizona, Seminar Chair and Panelist, December 2013


    “Know Your Appeal (and Avoid Losing It Before It Starts),” State Bar of Arizona CLE by the Sea, Seminar Co-Chair and Panelist, July 2013


    “Rules Maintenance: Civil Rules Update, the Restyled Arizona Rules of Evidence, and the Adoption of Daubert in Arizona,” State Bar of Arizona CLE by the Sea, Seminar Co-Chair and Panelist, July 2013


    “Current Trends in Discovery, Disclosure, ADR and Expert Witness Preparation and Testimony,” State Bar of Arizona CLE by the Sea, Seminar Co-Chair and Panelist, July 2013


    “Challenges of Technology in 21st Century Law Practice,” State Bar of Arizona CLE by the Sea, Panelist, July 2013


    “2013 Civil Rules Update,” Arizona Association of Defense Counsel, Seminar Chair and Co-Presenter, February 2013


    “The Rules They Are A-Changin’ (Again): 2013 Arizona Civil Rules Update,” State Bar of Arizona, Seminar Chair and Co-Presenter, January 2013 


    “The Rules Are Changing! Litigators Beware!” Scottsdale Bar Association, December 2012


    “The Challenges of New Technologies in Law Practice,” State Bar of Arizona, Panelist, March 2012


    “Nuts & Bolts of Civil Practice & Procedure: Views from the Bench and Bar,” State Bar of Arizona, Seminar Chair, 2006-2009, 2011, 2012


    “Effective Deposition Practice,” DNA People’s Legal Services, Inc. (Guest Lecturer), October 2011


    “Civil Litigation Rules and Case Law Update,” State Bar of Arizona, Seminar Chair, 2008-2011; Faculty Member, 2003-2007


    “Overview of the American Justice System,” Western International University (guest lecturer), June 2010


    “Update on Changes in the Federal and Arizona Rules of Civil Procedure and Rules of Evidence,” Civil Division, Arizona Attorney General’s Office, April 2010


    “The New E-Discovery Rules,” Thurgood Marshall Inn of Court, 2008


    “Case-Dispositive Motions: Rules 12 and 56 Compared and Contrasted,” In-House Associate Seminar, 2007


    “Strategic Use and Timing of Discovery Devices,” In-House Associate Seminar, 2006


    “Objective-Driven Pleading,” In-House Associate Seminar, 2006

Court Admissions

All Arizona Courts

U.S. District Court for the District of Arizona

U.S. Court of Appeals for the Ninth Circuit

Colorado State Courts

Education

J.D., University of Denver, 1994 

B.S., University of Richmond, 1991

Birthplace

Mexico City

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