William P. Gagnon

Contact Information


William P. Gagnon

Founder, President

Bill is the founder and President of GAGNON and is responsible for the overall leadership and growth of the Firm. Bill focuses on delivering big firm-quality services to his clients through a model that allows for the reduced cost structure and dedication to client service that one would expect from a smaller firm.

Prior to establishing GAGNON, Bill was the partner-in-charge of the Northeast State Tax Consulting practice of Pricewaterhouse-Coopers (PwC). In his 15-year career in public accounting, he held numerous leadership positions in two different Big Four firms.

While at PwC, Bill also led the PwC domestic tax optimization practice, and served as partner-in-charge of both the Energy and Retail industry segments of this practice. In that capacity, he directed national tax optimization projects for many companies, ranging from Fortune 50 to large, privately held organizations. Bill possesses deep technical skills with a concentration in the domestic taxation of multinational businesses.

Bill is a CPA and has been a part-time faculty member at Boston University and the Graduate School of Professional Accounting at Northeastern University. He is also a member of the Advisory Board for the Bentley College Master of Science in Taxation program. Bill earned his B.B.A. in Accounting from the University of Massachusetts at Amherst and went on to receive his Master of Science in Taxation from Bentley College in Waltham, Massachusetts.

Bill is active in a number of charities and serves on the Board and as Treasurer of the South Shore Conservatory and is a past President of the Duxbury Education Foundation. Bill has been married for 25 years, has two sons and resides in Duxbury, Massachusetts.

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