Isaacson & Walsh, 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 & Walsh. Don previously served as Rules Counsel, Majority Counsel and Director of Research for the Arizona House of Representatives.

The firm employs two other professionals. Cheyenne Walsh, an attorney, joined the firm in 2015, and has ten years of experience representing clients before the Arizona Legislature and an additional three years working on the Arizona legislative staff. 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.