Sean Brune

Years Experience

14 years


College of William & Mary
M.S. in Accounting
B.S. in Business Administration

Industry Expertise

Life Sciences, Manufacturing, Software, Technology

Big Four Alma Mater


Sean Brune

Director – Tax

Sean brings 14 years of corporate income tax accounting and financial reporting experience to WilliamsMarston. Since joining WilliamsMarston, Sean has focused primarily on income tax accounting and advising clients on complex transactions such as initial public offerings, mergers and acquisitions and accounting standard updates. Sean’s industry experience includes life sciences, manufacturing, software and technology.

Prior to joining WilliamsMarston, Sean was a Senior Manager in EY LLP’s Global Tax Compliance & Reporting practice where he provided comprehensive business tax advisory, compliance, and assurance services to public and private corporate clients. He also assisted clients with initial public offerings and performed a wide variety of domestic and international tax advisory services. His expertise includes income tax accounting under US GAAP and IFRS, tax compliance issues and transaction advisory services. In addition to his time in EY’s Boston office, Sean spent 3 years in EY’s London office performing tax accounting and risk advisory services for clients in the European market including transaction tax accounting assistance, US GAAP to IFRS financial statement conversions and tax account remediation services.

Sean is a Certified Public Accountant in the Commonwealth of Massachusetts and holds a Master of Science in Accounting degree and a Bachelors of Business Administration in Accounting from the College of William & Mary, where he graduated magna cum laude.