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Isaacson Law Firm, P.C.


Isaacson Law Firm, P.C., is incorporated in Arizona as a professional corporation. The firm represents a broad range of clients before the Arizona Legislature and Arizona state government. Don Isaacson founded the lobbying practice in 1985 and is the shareholder and the director of Isaacson Law Firm, P.C.. Don previously served as Rules Counsel, Majority Counsel and Director of Research for the Arizona House of Representatives.

Marie Isaacson joined the firm in 2018 and has thirty years of experience in Arizona state government. Most recently, Marie served as the Director of Human Resources and the Director of Benefits for the State of Arizona.

The firm has been recognized as the state’s “Best Lobbying Firm” for each of the three past years that the award has been granted by the Arizona Capitol Times (2016-2018), the leading source of political news in Arizona. The annual “Best of the Capitol” awards are based on voting by individuals involved in policy-making in Arizona, including elected officials, legislative and executive staff, lobbyist and others actively engaged in the legislative process in Arizona. The Capitol Times noted, “At the state Capitol, Isaacson’s work stands out, and colleagues regard him as the consummate professional, the lobbyist who understands that a good lobbyist fights the good fight for his clients but doesn’t seek to tear down his opponents.”

The firm has appeared consistently in the U.S. News & World Report’s ranking of Best Law Firms (Tier 1). It has been rated “AV Preeminent” by Martindale-Hubbell for 30 years and is listed in its Bar Register of Preeminent Firms.


For over 35 years, the firm of Isaacson Law Firm, P.C. has provided high level legal and government relations services to a diverse clientele, including Fortune 500 companies, small independent businesses, trade and professional associations, and everything in between.

Specific areas of expertise include banking, insurance, telecommunications, pharmaceuticals, optometry, higher education, law enforcement, wholesale liquor and various other trades. In addition to a significant amount of representation before the Arizona State Legislature and local governments, the firm represents clients before various Arizona state agencies in regulatory matters, including the Department of Health Services, State Liquor Department, Arizona Health Care Cost Containment System, Department of Insurance, Board of Regents, and others. The firm also serves as general counsel for commercial enterprises having interests within and outside Arizona. Isaacson Law Firm, P.C.’s research-based, non-partisan approach to public policy has helped build lasting working relationships with clients, government officials and even opponents of their lobbying efforts.


DONALD G. ISAACSON received his bachelor’s degree from Augustana College, and his law degree from Arizona State University, where he was a member of the editorial board of the Law Journal. Mr. Isaacson has been in private practice primarily in the area of governmental consulting and lobbying. Throughout his career, he has been active on the legislative committees of the State Bar Association and the Arizona and Phoenix Chambers of Commerce. He has served as the Chairman of the State Bar's Professional Liability Committee. He is on the Board of Directors of the Arizona Chamber of Commerce and Vice-Chairman of its Water, Energy & Natural Resources Committee. He also chairs the Phoenix Chamber's Health & Insurance Committee.

In nine of the past 10 years (2019, 2018, 2017, 2016, 2015, 2014, 2012, 2011 and 2010), Don Isaacson has been recognized as “Best Lobbyist” by the Arizona Capitol Times. He was awarded the "Toughest Lobbyist to Go Up Against" in 2019. He is also consistently ranked by his peers as a top lawyer in the field of government relations in The Best Lawyers in America, one of the most credible and definitive guides to legal expertise in the United States.

MARIE ISAACSON received her Bachelor of Science and Master's in Business Administration from Arizona State University. Immediately prior to joining Isaacson Law Firm, P.C., Ms. Isaacson was the Benefits Director for the State of Arizona, managing the Health Insurance Trust Fund and self-funded medical, pharmacy and dental plans, as well as fully insured dental, vision, life and disability plans. In her nearly 31-year career with the State of Arizona, she served in many leadership roles at the State, including the State's Human Resources Director and Human Resources Deputy Director. She has worked on a variety of policy issues and legislation and with the 100+ state agencies, boards and commissions. Ms. Isaacson is a Flinn-Brown Fellow and holds national certifications in human resources. She joined the firm in July 2018.