Kostelanetz LLP
Law PracticeNew York, United States51-200 Employees
Kostelanetz LLP is a New York City-based law practice with more than seven decades of experience handling high-stakes controversies and negotiations with government agencies. Its core strengths lie in tax controversies and white-collar defense, while it also provides tax and estate planning, commercial litigation, government procurement, and government contracting services. The firm draws on attorneys who have previously held senior roles in the Internal Revenue Service and the Department of Justice, and several lawyers have served as federal judicial law clerks or hold advanced degrees in taxation. Kostelanetz has been recognized in major legal rankings, with partners listed in Best Lawyers and Super Lawyers and the firm named Tax Team of the Year by Chambers USA in 2018. Recent development includes the addition of two partners in 2025, Victor Suthammanont and Melissa Wiley, expanding the New York office.