The Marnell Law Group concentrates focus in complex divorce, matrimonial and family law. For nearly 30 years, members of the firm have provided exceptional legal representation to residents of Long Island and surrounding New York City boroughs, defending the rights and interests of clients amid divorce, custody and family law proceedings. 

Unique to our firm is cross-industry expertise, not only in business and law, but finance as well. This knowledge base becomes invaluable in complex divorce proceedings where forensic accounting, business analysis and review of short and long-term financial investments must be completed.  As a boutique New York-based law firm, we’re nimble, flexible, and maintain strategic partnerships with trusted professionals to deliver the support required for our client’s to successfully conclude all negotiations. 

With combined internal bench strength and thorough preparation, our firm has successfully litigated more than 200 trials involving complex custody, equitable distribution, and child support and maintenance issues.

The firm’s founder, Russell I. Marnell, is an expert in the area of complex divorce, matrimony and family law. When not litigating on behalf of his clients, he frequently contributes articles on complex family law subjects, and is a highly sought after guest lecturer. Our firm is dedicated to serving our clients, which we prove by delivering 'Client Centered, Client Focused Care'​ to all.

Marnell Law Group

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Marnell Law Group

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