What Makes Us Unique

Consistent, dedicated team year after year. Expertise competitive with national and regional firms. An award winning firm in Fairfax, Virginia.

Consistent, dedicated team year after year.

As our client, our goal is to assign the same personnel to your engagement each year—staff who know you and are committed to you and the firm. Our employee turnover rate is lower than normal for firms in this area.  Based on scores from our employees, the Washington Post has selected us for their “Top Workplaces" award almost every year since 2014. Staff members responsible for client service average over 20 years of public accounting experience with over 70% of that time spent with Thompson Greenspon.  We value long-term relationships with our clients and employees.

a meeting room full of staff and cpa's getting training

Expertise competitive with national and regional firms.

We assist privately-held and closely-held family businesses with their business and personal needs by providing the resources and having the depth of expertise they need to grow.  At Thompson Greenspon, 65% of our professional staff are experienced CPAs, substantially more than at the Big 4 accounting firms.

An award winning firm in Fairfax, Virginia

First, we listen to understand your goals and concerns, then we work with you to provide personalized services to meet your needs. Ratings from our existing clients earned us the 2017, 2018, 2019, & 2021 Best of Accounting™ Award for service excellence. Less than 1% of all accounting firms in the United States and Canada have received this honor.

Industries we have specialized in since 1956:

Construction, real estate, and government contracting entities, professional service firms, and nonprofits are just some of the industries that seek our accounting, audit, and tax services, as do individuals. Our areas of specialization include taxes, financial reporting (audits, reviews, and compilations), advisory services, outsourced accounting, and employee benefit plan audits. Our tax concentrations include strategic tax planning and preparation, IRS representation, state and local tax representation, estate and succession planning, and international tax including transfer pricing studies.

“Everything we do starts with understanding our client's business inside out. It's the key to providing creative, forward looking advice and building long-term relationships. It helps us anticipate our client’s unique needs and to present new and different opportunities.”


Who We Are

We care about our employees and are committed to providing support for their career development while encouraging a positive work/life balance. This support translates to a high quality of work, staff members who enjoy their jobs, and exceptional client service. The Washington Post has named us one of DC’s top workplaces eight times.  This reflects the care we take of our staff—and of you.


At Thompson Greenspon, 75% of our professional staff are experienced CPAs, substantially more than at the Big 4 accounting firms. In addition to our professional credentials, we offer a sincere desire to understand our clients’ needs and to provide personalized, truly valuable service.

Meet our Team >


We can tell you plenty about how we serve clients, but you might learn even more directly from those who have worked with us.

“20 years of outstanding service. Thanks.”

– Mike S.

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For how long has Thompson Greenspon offered clients exceptional tax and accounting advice? Since 1956—before the Beltway was built! Since then, the firm has continued to adopt the latest practices and technology and added many talented accountants, growing to a team of more than 60 staff.

Discover our History >

In the Community

Thompson Greenspon principals and staff are active in a variety of nonprofits and community efforts in the Washington, DC, metro area. It’s our way to learn what challenges and opportunities our nonprofit clients face—and, more importantly, for us to support the community in which we work.

Learn About our Community Involvement >

Affiliations and Memberships

To learn as much as possible about our client’s industries, our team members join professional associations. This access to industry resources and networking opportunities gives us insight into financial and tax issues that you as our client may face, and helps us to better serve you.

See our Memberships >

Chat with our Tax and Accounting Specialists

At Thompson Greenspon, we enjoy helping clients and would like to learn how we can help you. If you have tax or accounting needs or questions, please schedule a consultation.

Contact Us >

cpas at a conference table