2026 Frank Agostino Kostelanetz LLP Series

John began his tax career in 1987 and passed the IRS Special Enrollment Exam in 1995. A National Tax Practice Institute fellow and SUNY Oswego graduate, he specializes in taxation for non-resident aliens, U.S. citizens living abroad, S corps, legal marijuana businesses, and cryptocurrency.

John is passionate about giving back to the profession. Every year on Giving Tuesday, Tax Practice Pro offers a free ethics webinar, and its weekly Tax Update webinars keep tax professionals informed on the latest developments. These programs combine practical guidance, strategies, and insights to help practitioners work smarter, faster, and with confidence.

Whether you’re just starting your career or expanding an established practice, Tax Practice Pro and John Sheeley, EA provide the education, coaching, and community support tax professionals need to succeed.

Frank Agostino is one of the most accomplished tax controversy attorneys in the country, with more than four decades of litigation experience and a string of landmark victories that have reshaped IRS enforcement and Tax Court procedure — including Commissioner v. Zuch before the U.S. Supreme Court (2025) and Chai v. Commissioner in the Second Circuit (2017).

Because of Frank’s stellar reputation in the tax bar, he has been ranked in Chambers in Band 1 for Tax: Fraud Nationwide (USA) and in Band 1 for High Net Worth Private Client: Tax.

A former IRS District Counsel attorney and Special Assistant U.S. Attorney, Frank has also taught tax controversy at Seton Hall and Rutgers Law, and currently serves on the Advisory Board of the Journal of Tax Practice and Procedure.