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Recently recognized by Accounting Today as a “Firm to Watch,” Whittlesey is one of the largest regional business information technology services and accounting firms in New England. Through our four divisions – Assurance, Advisory, Tax, and Technology - we provide both traditional and nontraditional services, as well as expert counsel in the areas of accounting, security, IT, and business structure. In fact, clients have come to think of us as an extension of their leadership team, delivering advisory services now with a critical eye toward the future, to foster continued growth and success. It's an approach we call Forward Advising™.

For more than five decades, Whittlesey has provided assurance services to thousands of for-profit and nonprofit clients. Focused on integrity and service, we customize our approach based on your specific needs while also providing business guidance, especially when key decisions need validation.

When objectives and related decisions are of critical importance, Whittlesey provides expert counsel in a variety of areas, including business, strategic and succession planning, asset protection, estate planning, security, tax advising, and computer network consulting.


Whittlesey has offered federal and state tax services for both individuals and businesses for more than five decades, working with clients year-round to provide services that cover everything from tax planning and preparation to tax compliance and financial audits.

Whittlesey provides businesses and nonprofit organizations with personalized services to optimize their technology, including network security and information systems reviews, with specialization in the areas of nonprofit technology, systems support, and cybersecurity.

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