Don co-founded Beaird Harris, PLLC, a Certified Public Accounting firm in 1988. As a principal of Beaird Harris Wealth Management, LLC, Don specializes in wealth management strategies for high net worth individuals, including asset protection, estate planning, charitable giving, and family wealth counseling. He also provides tax and business consulting. Don has worked in public accounting since 1976. Don was a senior audit manager with Arthur Andersen when he left to establish a local public accounting practice in 1986.

Don is a 1976 graduate of Abilene Christian University. He is a licensed Investment Advisory Representative and a member of the National Association of Family Wealth Counselors. Don is also a member of both the American Institute of Certified Public Accountants and the Texas Society of CPAs.