Katie Castelli


Bryant University
M.S. in Accountancy
B.S. in Business Administration

Years of Experience

8 Years

Industry Expertise

Biotechnology, Life Sciences, Medical Devices

Big Four Alma Mater


Katie Castelli

Manager – Tax

Katie brings over eight years of corporate income tax compliance and reporting experience to WilliamsMarston.

Prior to joining WilliamsMarston, Katie worked in EY LLP’s Global Compliance & Reporting practice in Boston. While at EY, Katie prepared US federal, state and foreign income tax returns, prepared and audited the tax provisions for domestic and multinational entities, and performed a wide variety of tax advisory services. Katie’s industry experience includes biotechnology, medical devices, and life sciences, amongst others.

Katie holds a Master of Professional Accountancy degree and a Bachelor of Science degree in Business Administration with a concentration in Accounting from Bryant University.