Glenn McCoy

Overview

Glenn McCoy is a Principal in Ryan’s National Tax practice, based in the Firm’s New York office. He advises clients on complex, multijurisdictional state and local tax matters, with a particular focus on state income and franchise tax planning, controversy, and transactional analysis. Glenn works closely with organizations across industries to integrate Ryan’s multidisciplinary tax capabilities into practical strategies that manage risk, resolve disputes, and support business objectives.

Glenn brings extensive experience spanning public accounting, industry, government, and academia. His background includes senior leadership roles within national accounting firms, corporate tax departments, and Ryan, as well as service with the Oklahoma Tax Commission. A recognized authority in state income taxation and tax ethics, Glenn is a frequent speaker and published author on state and local tax topics and has taught as an adjunct professor at Georgetown University Law Center. His leadership emphasizes technical rigor, ethical practice, and clear, defensible tax positions.

Education & Qualifications

Juris Doctor, The University of Oklahoma College of Law

Bachelor of Business Administration, Accounting, Oklahoma State University

Certified Member of the Institute (CMI), Income Tax, Institute for Professionals in Taxation

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

Experience & Achievements

Principal, National Tax, Ryan, New York office

• Advises clients on multistate income and franchise tax strategy, controversy, and transactions

• Leverages Ryan’s national practices to deliver integrated state and local tax solutions

Principal and Practice Leader, State Income and Franchise Tax, Ryan

Director, State and Local Tax, national accounting firm

National Partner in Charge, State and Local Tax, national accounting firm

Director, State Taxes, Fortune 500 oil and gas company

Administrator and Director, Income Tax Division, Oklahoma Tax Commission

Adjunct Professor, Georgetown University Law Center

Board of Governors Member, Institute for Professionals in Taxation

Executive Committee Member, State and Local Tax Section, American Bar Association

Member, Tax Notes State Advisory Council

Member, State Tax Advisory Board, Bloomberg Industry Group

Executive Committee Member, National Association of State Bar Tax Sections