Sarah Sexton Martinez

Sarah serves as a Managing Director in the Tax Practice Policy & Quality group at Grant Thornton Advisors LLC. In this role, she supports the firm’s tax practice through policy development, quality initiatives, and technical guidance aligned with professional standards. Her areas of focus include partnerships, artificial intelligence, crypto and digital assets, and reportable transactions.

She brings extensive federal tax experience from both public accounting and government service and is well‑versed in federal tax practice and procedure. Her academic training and professional background give her a strong foundation for assessing risk in complex federal tax matters.

Sarah has deep experience in tax controversy, procedure, and regulatory compliance. She joined Grant Thornton from RSM, where she represented clients before IRS Examination, Appeals, and Collections and advised on complex federal tax issues. Prior to her public accounting roles, she spent more than a decade with the IRS Office of Chief Counsel, litigating and resolving federal tax disputes and advising on corporate, partnership, individual, and international tax matters.

She is also a frequent instructor and presenter, having served as an Adjunct Professor of Federal Income Tax and published on federal tax law and procedural developments.