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Michael Mason

Mike returned to GT in 2018 and continues his global labor and employment practice. Clients from the technology and other industries turn to Mike for policy drafting, internal investigations, compliance advice, management training, representation before administrative agencies, and, when necessary, litigation.

Mike knows what corporate legal departments expect from their outside lawyers. For over a year, Mike has been imbedded with the legal department of a large international company providing global L&E support and leading internal investigations. Mike also spent six years in executive roles as Senior L&E Counsel and Director of Human Resources at publicly-traded Pinnacle West Capital Corporation. In those roles, he oversaw litigation, selected and managed outside counsel, and oversaw part of the company’s compliance function. He also conducted internal investigations and audit responses, trained management, managed a team of HR professionals, served as lead negotiator in collective bargaining, led the diversity and inclusion program, and represented the company before federal administrative agencies including the NLRB, EEOC, DOL, OFCCP, OSHA, and NRC.

Mike is the Chair of the Employment & Labor Section of the State Bar of Arizona. He has also served on the House of Delegates of the American Bar Association and on the Board of Governors of the State Bar of Arizona. Mike received his J.D. from Arizona State University College of Law and his B.A. from Arizona State University, and attended the Executive Education Program at the Kellogg School of Management, Northwestern University.


  • Compliance
  • Employment counseling
  • Internal investigations
  • Employment due diligence for M&A transactions
  • Employee privacy
  • Executive contracts and negotiations
  • Employment litigation
  • Arbitration, mediation
  • Collective bargaining support/strategy



  • Pinnacle West Capital Corp., Phoenix, AZ, 2012-2018
    • Director, Human Resources, 2014-2018
    • Senior Labor & Employment Counsel, 2012-2014
  • Greenberg Traurig, LLP, Phoenix, AZ, 2005-2012


  • Listed, The Best Lawyers in America, Labor and Employment Law - Management, 2020 
  • Listed,The Legal 500 United States, 2019
    • Labor and Employment - Labor and Employment Disputes (Including Collective Actions) - Defense, 2019
    • Labor and Employment - Labor-Management Relations, 2019
    • Labor and Employment - Workplace and Employment Counseling, 2019
  • Recipient, Association of Corporate Counsel, "Arizona Corporate Counsel of the Year,” 2014
  • Valley Leadership Institute, Class 34
  • Chair, Employment & Labor Section of the State Bar of Arizona
  • Board of Directors, The Herberger Theater Center, 2017-present
  • Delegate, American Bar Association House of Delegates, 2009-2015
  • Board of Directors and Vice President, Boys and Girls Clubs of the East Valley, 2007-2011
  • Board of Directors, Valley of the Sun Human Resources Association, 2011-2012
  • Board of Governors, State Bar of Arizona, 2007-2008
  • Member, SHRM; AZ HR Executive Forum 2014-present


  • Executive Leadership Program, Northwestern University, Kellogg School of Management, 2015
  • 法務博士, Arizona State University Sandra Day O'Connor College of Law, 2002
  • 学士号, Arizona State University, 1999
  • Certification, SHRM-SCP
  • Arizona
  • カリフォルニア州