Accounting, Tax Planning, Compliance

Providing over 35 Years of service.

Welcome to Thorn Lewis + Duncan

Southern Ohio Certified Public Accountants, Tax Service, Business Advisor

Building a Brighter Future – Together

We're delighted to announce that Thorn Lewis + Duncan is joining forces with Barnes Dennig - one of Cincinnati’s largest accounting firms - in a historic move that will help us drive new levels of success for our clients. Find out more.


We are a Dayton, Ohio firm of certified public accountants and business advisors with extensive experience serving clients locally as well as those with multistate operations.  We are small enough to offer flexibility and rapid decision-making, yet large enough to provide a wide range of specialty services.  Whether corporate, partnership or individual client, our depth of expertise enables us to provide you with the exceptional service you deserve.

Our firm of certified public accountants and business advisors provides professional, proactive and timely advice to our clients on accounting, tax and business matters while maintaining a professional atmosphere that encourages personal and professional growth for our employees.

Serving the
Southern Ohio region, including
Dayton, Cincinnati and Columbus