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Semi-Retired - Partner

Dan Duncan - Ducan, Onley & Watkins, P.C.

As of 2023, Dan has entered into semi-retirement and is not taking new clients.


If you were to say that taxes and accounting were in Dan's family lineage, you'd be correct. Dan's Uncle, G. Wilson Duncan, started our firm in the early 1940's. In 1975, Dan married his high school sweetheart, Kaye. Just one year later, Dan took a job with our firm while he was still in college at Oklahoma State University. A native of Stillwater, Dan has been with our firm ever since. Both of Dan's parents had long careers at our firm as well.

Dan is an Enrolled Agent with the IRS and an Accredited Tax Advisor with over 45 years of experience. He also serves on several community boards and enjoys giving back to the Stillwater community.

Certifications & Honors

Civic Affiliations


  • Enrolled Agent (EA)

  • Accredited Tax Advisor, Accreditation Council for Accountancy & Taxation, 1991

  • Stillwater Medical Center Board of Trustees, 2011

  • BancFirst Stillwater, Advisory Director

  • Oklahoma State University Alumni Association, Life Member

  • B.S. Business Administration & Accounting, Oklahoma State University, 1978

Get in Touch with Dan


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