Let us be your most trusted advisor

Serving the Greater Boston area and Southern New Hampshire, Sullivan and Gannon, LLC is a full service accounting firm located just 10 minutes from downtown Lowell, in Chelmsford, MA.  Our team of CPAs and accounting professionals provides accounting, tax and advisory services to a wide range of clients, including large and small businesses, non-profit organizations, and individuals.

We're an accounting firm that offers a personalized, comprehensive, professional approach. Whether we're handling your business or personal taxes, audit, or other accounting needs, we'll work with your attorneys, bankers and investment advisors to provide solutions that best meet your specific needs.