A Fifty Year Old CPA Firm That Thinks Like a Partner

Headquartered in Newburyport, Massachusetts. Built around the businesses we serve.

Our Story

Ambrosi Donahue Congdon and Co., P.C. has been serving business owners and their families for over fifty years. In July 2022, Anthony Rita and Brittany Leary stepped in as the firm’s new ownership, and have been steadily moving ADC toward the kind of practice they would want as clients themselves. Less reactive. Less transactional. More year round, more strategic, more in the loop.

That shift is intentional. The firms that win in the next decade are not the ones grinding out the highest volume of one and done returns. They are the ones who sit beside owners and help them think clearly about money, tax, and growth, all year long. That is the firm we are building.

ADC partners

Our Mission

To provide innovative strategic solutions and develop meaningful relationships with value minded clients through an intentional, collaborative approach.

Our Vision

Simplifying financial challenges through strategic thinking and collaboration.

Our Values

Strategic Thinking

We look at what is coming, not just what already happened. Tax planning before year end. Cash flow conversations before the squeeze. Decisions made with eyes open.

Collaboration

The best client work happens in dialogue, not handoffs. We are part of your team, on your timeline, with shared context.

Meaningful Relationships

We want to know your business well enough that we can spot something a stranger would miss. That depth of relationship takes time and intention. We invest both.

Our Team

Accounting experts, each with their own unique area of focus to meet your ever-changing needs.

Anthony Rita, MSA, CPA

Partner | Commercial Division
Twenty plus years guiding closely held businesses through tax, audit, and the strategic decisions in...

Brittany Leary, MBA, CPA

Partner | Government Contracting and R&D Division (formerly Moker CPA PC)
Outsourced advisory, accounting and tax for venture-backed and government-funded R&D startups, built on more than...

George G. Moker, EDD, MBA, CPA

Director | Government Contracting and R&D Division (formerly Moker CPA PC)
Thirty plus years working with venture-backed and government-funded R&D startups, founder of Moker CPA PC,...

Keith Congdon, CPA

Director | Commercial Division
Three decades of tax, audit, and corporate experience working with closely held manufacturers, technology companies,...

Robert Poirier, CPA

Senior Director | Commercial Division
Quality assurance backbone of ADC's tax compliance and assurance work, with thirty plus years in...

Abbey Collingwood, CPA

Senior Manager | Commercial Division
Leads ADC’s individual tax team, handling the year-round advisory led work that sits alongside ADC's...

Jaime Martel, MBA, CPA

Manager | Commercial Division
Manages commercial corporate tax and assurance engagements for ADC's local small business client base.

Niki LeMaitre, CPA

Tax Manager | Government Contracting and R&D Division
Manages corporate tax for venture-backed and government-funded R&D start-ups, with a specialty in research and...

Ready for a CPA Who Works the Way You Do?

Tell us about your business. We will tell you whether we are a fit, and what working together would look like.

Schedule a Consultation