Stephen E. Sellick

Senior Vice President, Litigation Services


M.A., Public Policies Study, University of Chicago, 1993
B.S., Economics, Wharton School, University of Pennsylvania, 1989


Stephen E. Sellick manages the Litigation Consulting practice at Nathan and is the Managing Director and Founder of Gnarus Advisors LLC, a wholly owned subsidiary of Nathan. Mr. Sellick is also a member of Nathan’s Board of Directors.

Mr. Sellick is a leader in complex quantitative analysis in litigation and public policy and has been entrusted by clients to provide counsel, analysis, and expert testimony on a wide variety of subjects including insurance allocation, mass torts, and product liability claims. Steve has evaluated such claims in the context of insurance allocation, internal management, cost allocation, cost recovery, and litigation risk analysis. He has also participated in studies involving regulatory economics, cost accounting, and financial analysis of the electric utility industry.

Mr. Sellick has 25 years of experience in the litigation consulting / expert services industry in firms including Putnam, Hayes & Bartlett, PA Consulting Group, and LECG before founding Gnarus in 2007. Nathan Associates acquired Gnarus in May 2017.

Mr. Sellick holds an M.A. in Public Policy Studies from the Harris School at University of Chicago and a B.S. in Economics from the Wharton School at the University of Pennsylvania.

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