Marcus is a principal with over 15 years of providing tax and business advisory services.
As one of the leaders of Withum’s Tax Controversy practice, he has extensive experience in resolving federal, state and local tax controversies including, but not limited to, matters involving Tax Examinations, Appeals, Collections, Innocent Spouse, Responsible Party, and Offer-in-Compromise.
In addition, he has experience in the field of law representing clients in commercial and tax disputes before state courts, Federal District Court and the United States Tax Court. Marcus also has extensive experience in alternative dispute resolution, which he frequently used to resolve disputes by means other than litigation.
As for business transactions, he has experience in drafting, reviewing and negotiating the language of a wide array of transactions documents including, but not limited to, buy/sell agreements, portfolio management agreements, swap agreements, limited liability company agreements and indentures.
He is admitted to practice law in Federal District Court as well as United States Tax Court.
Learn more about my professional experience and how I spend my time outside the firm.
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The appeal many expected has arrived, but the real question is what comes next. For months, taxpayers and practitioners have wondered whether the IRS would ultimately accept the implications of Kwong v. United States or continue defending its interpretation of the COVID-era relief provisions under IRC §7508A(d). We now have part of that answer. The…
Marcus draws on his law background to represent clients in commercial and tax disputes before state courts, Federal District Court and the United States Tax Court, frequently resolving matters through alternative dispute resolution rather than litigation. As an industry thought leader, Marcus contributes to a wide range of publications, helping businesses and individuals navigate high-risk…
The line between tax auditors policing mere civil infractions and investigators pursuing serious tax crimes is beginning to blur in the latest reorganization at the top of the Internal Revenue Service. Jarod Koopman, a long-time and well-known criminal investigator, assumed the role of Chief Compliance Officer in October 2025, and, under the most recent shake-up,…