William D. “Bill” Duncan, CPA


Bill graduated with honors from Wright State University in 1975 with a Bachelor of Science in Business Administration. Bill combined his practice with Thorn Lewis + Duncan in 1996 and served as managing shareholder from 2014 through 2019.  He was a partner with Stout and Duncan, Inc. from 1985 to 1995. From 1974 to 1985 he was employed by Deloitte Haskins & Sells nka Deloitte.

Bill provides a wide variety of accounting, tax, and business consulting services to his clients. His primary focus is with closely held companies in the construction, real estate, manufacturing, and wholesale/distribution industries.

Bill is a member of the American Institute of Certified Public Accountants and the Ohio Society of Certified Public Accountants.

He is a current member and former chair of the Board of Trustees of Goodwill/Easter Seals of the Miami Valley.  He currently serves on the Board of Governance and Executive Committees for the organization.  Bill is an active member of the Church of the Cross United Methodist in Kettering, Ohio. He currently serves as chair of the World of Love learning center and is a member of the finance committee of the church.

Bill has served on Oakwood City Council since 2003. He was elected Mayor of the City of Oakwood in January 2010.  He currently serves on the Board of the Greater Dayton Mayors and Managers Association.

Bill is a 1997 graduate of Leadership Ohio. Bill previously served as treasurer and member of the Board of Directors/Trustees of the Wright State University Alumni Association and the Wright State University Foundation. He is currently a member of the Planned Giving Advisory Council of Wright State University.


“Everyone I’ve spoken to at Barnes Dennig has always been friendly and helpful, even for random issues and questions that we have had.  Everyone has been willing to help with not only any regular work that was scheduled but also for any extra topics where we have needed some professional accounting explanations.  Everyone has worked hard on getting the work done thoroughly and on meeting deadlines.”

– Barnes Dennig Client, 2021

“Barnes Dennig is very responsive and listens to the goals of the business.”

– Barnes Dennig Client, 2021

“I have a great relationship with the audit partner and audit manager on the team.  I know that my calls will be answered in a timely manner.  The firm offers proactive advice on how to better the organization.  I value the expertise that Barnes Dennig has in the not-for-profit sector.”

– Barnes Dennig Client, 2021