Chicago Tax Lawyer Welcomes You! Mr. Andrew Gordon has represented many individuals and businesses with sales tax problems, tax collection problems & audit. represent clients in the resolution of tax problems related to the IRS and the Illinois Department of Revenue. He represents many individuals and businesses with sales tax problems, tax collection problems, and audit issues. He represents clients throughout Chicagoland, and I have been practicing in Illinois for many years. He has represented taxpayers in thousands of tax-related cases, and he can help you to.