Debra Lewis-Mahon Debra is Managing Director at Westmark Tax Group. She has over 10 years of dedicated experience providing US tax consulting, compliance, and representation services to both domestic and international individuals, businesses, and accounting firms such as Westmark Tax, Grant Thornton LLP and CACG PC. Debra is an IRS Enrolled Agent (EA) licensed by the US Department of the Treasury as a tax expert authorized to represent taxpayers before the IRS. Considering three countries home, she is uniquely qualified to understand the intricacies of US tax for international taxpayers.