Of Counsel Illinois / Washington, DC (202) 484-5224 [email protected] Marilyn A. Wethekam, Esq. is Of Counsel to the Council On State Taxation. COST, with a membership of over 500 multistate corporations, is dedicated to preserving and promoting equitable and nondiscriminatory state taxation of multi-jurisdictional entities. Prior to joining COST Ms. Wethekam was a partner at HMB Legal Counsel in Chicago where she had a national SALT practice representing multistate and multinational corporations in all areas of state tax advising clients on multistate tax issues involving income, franchise, and transaction taxes. Prior to going into private practice, Ms. Wethekam was tax counsel for both Mobil Oil Corporation and Montgomery Ward & Co. where she developed an understanding of the complex issues encountered by multistate and multinational corporations. Ms. Wethekam serves on the Bloomberg BNA State Tax Advisory Board, State Tax Notes Advisory Board, and the Advisory Board of the Paul J. Hartman State Tax Forum. She is a frequent speaker before national tax organizations such as The Paul J. Hartman State Tax Forum; COST; the Tax Executives Institute and the Federation of Tax Administrators. Ms. Wethekam is a past Chair of COST. In 2010 Ms. Wethekam was named as the second recipient of the COST Paul Frankel Excellence in State Taxation Award. She received the 2012 Bloomberg BNA, Frank Latcham Award for Distinguished Service in State and Local Tax Law, was named one of the 2016 Outstanding Women in Tax, by Tax Notes, in 2018 named by Crain’s as one of Chicago's Notable Women Lawyers and in 2023 received the Paul J. Hartman award for contributions to the state and local tax profession. She has an LLM in Taxation from the University of Illinois Chicago, is a graduate of Illinois Institute of Technology Kent College of Law and Loyola University of Chicago. Ms. Wethekam is a member of the US Supreme Court, Illinois, and Texas bars.
