About

Nancy Tonnessen is an attorney with Dewey Ballantine in New York, NY, where she practices general law with a client-focused and practical approach. Serving clients from the firm’s New York office, Ms. Tonnessen brings a broad legal perspective to her work and is committed to delivering thoughtful, responsive counsel tailored to each client’s needs. Her practice reflects the versatility and attention to detail that are essential in a general practice setting, where legal matters often require both careful analysis and clear communication. With her admission to the New York bar, Bar No. 2075331, Ms. Tonnessen is equipped to assist individuals and businesses navigating a wide range of legal issues. She understands that clients often seek not only legal knowledge, but also a steady advocate who can help them identify practical solutions and move forward with confidence. Her professional approach emphasizes accessibility, diligence, and a commitment to helping clients understand their options at every stage of the legal process. At Dewey Ballantine, Ms. Tonnessen contributes to a tradition of high-caliber legal service grounded in professionalism and integrity. She is dedicated to building strong client relationships and providing dependable representation in matters that demand both legal insight and personalized attention. Whether addressing routine concerns or more complex issues, she strives to deliver counsel that is clear, effective, and aligned with her clients’ goals.

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