Mark Eidman

Overview

Mark Eidman is a Principal and Practice Leader in Ryan’s Controversy Resolution practice, based in the Firm’s Austin office. He advises clients on complex, multijurisdictional transaction tax matters, providing audit defense, administrative appeals, and recovery services designed to resolve disputes efficiently and achieve defensible outcomes.

With more than 30 years of experience practicing state and local tax law, Mark brings deep technical expertise and authoritative insight to client representation. His background includes senior public-sector leadership as Director of the Hearings Division at the Texas Comptroller of Public Accounts, where he supervised all contested tax assessments statewide. This experience gives Mark a unique perspective on administrative procedures, regulatory expectations, and effective advocacy strategies. He is a frequent speaker on transaction tax and controversy topics and is actively engaged with professional and industry organizations focused on advancing best practices in tax dispute resolution.

Education and Qualifications

Juris Doctor, The University of Texas School of Law

Bachelor of Arts, The University of Texas at Austin

Attorney, Licensed in Texas (Ryan is not a law firm.)

Experience and Achievements

Principal and Practice Leader, Controversy Resolution, Ryan, Austin office

• Leads client representation for multijurisdictional transaction tax audits and appeals

• Advises on audit defense strategy and transaction tax recovery at the administrative hearings level

Director, Hearings Division, Texas Comptroller of Public Accounts

Supervised all contested tax assessments in the State of Texas

Practicing Attorney, State and Local Tax (Ryan is not a law firm.)

Member, Institute for Professionals in Taxation

Member, Texas Bar Association

Member, Texas Association of Taxpayers

Member, Comptroller of Public Accounts Industry Practitioner Liaison Group

Member, Board of State Taxation Committee

Member, Equipment Leasing Association

Member, Liaison Committee with Comptroller of Public Accounts