Professor Ginsberg teaches in the environmental, property and real estate fields. He is a vice president and member of the board of Citizens' Housing and Planning Council of New York, former chair of the Environmental Law Committee of the AALS, member of the board and president emeritus of the Catskill Center for Conservation and Development, and former chair of the New York State Bar Association Section on Environmental Law.

He is a member and former chair of the Committee on International Environmental Law and is a former member of the Environmental Law and Planning and Zoning Committees of the Association of the Bar of the City of New York. Professor Ginsberg is a member of the National Advisory Board of the Trust for Public Land and a member of the Advisory Committee of the Land Conservation Law Institute.

Professor Ginsberg has held an appointment as a visiting professor at New York University Law School. He has served as a hearing officer for the New York State Department of Environmental Conservation on matters concerning municipal and hazardous waste disposal and is the author of a report on the Love Canal tragedy for the Interagency Task Force on Hazardous Wastes. He has published, lectured and consulted on a variety of subjects in environmental, property and governmental fields, and is the co-author and editor of Environmental Law and Regulation in New York.

Prior to joining the faculty at Hofstra, Professor Ginsberg practiced law as a partner in the New York City law firm of Ginsberg, Schwab & Goldberg. He was general counsel and director of research of the New York State Temporary Commission on the Powers of Local Government; commissioner and first deputy administrator for the New York City Parks, Recreation, and Cultural Affairs Administration; and deputy and acting executive assistant to the president of the New York City Council.