In 1998, Tom Diehl joined Harbin Clinic as comptroller. He served in this role until 2003 when he became the chief financial officer. Before Harbin Clinic, Diehl worked as comptroller at Carolina Primary Care in Columbia, SC and audit manager at Ernst & Young in Charleston, WV. Diehl has a Bachelor of Science degree in Accounting from West Virginia University in Morgantown, WV. He is a Certified Public Accountant, a member of the American Institution of Certified Public Accountants (AICPA), and a graduate of Leadership Rome XIX.