Barry Kantrowitz was born in the Bronx and moved to Rockland County in 1967. He attended Fleetwood and Eldorado Elementary schools, Spring Valley Junior High School and Spring Valley High School. Barry graduated from Harpur College, SUNY Binghamton in 1982 with a BA in Political Science and attended Boston University School of Law, graduating cum laude, with a Juris Doctor degree in 1985 and returned to Rockland County to practice law.  Barry was appointed to the Rockland County Legislature on January 6, 2014. He currently serves on the Public Safety, Multi-Services and Environmental Committees.

Barry is a graduate of the first class of Leadership Rockland (1990-91). He has served on several local community boards including Junior Achievement of the Hudson Valley, The Rockland Community College Foundation (Executive Board,) Jewish Federation of Rockland and the JCC Rockland, where he served as President for several years and was a driving force in the acquisition, construction and development of the JCC's new Campus in West Nyack. Barry also served on the board of the national JCC Association, which is the continental umbrella organization for the Jewish Community Center Movement.

Barry Kantrowitz is a senior partner in the multi-state law firm Kantrowitz, Goldhamer & Graifman, P.C. He handles the day-to-day operations of the firm's non-matrimonial litigation department, trying civil, negligence, criminal and corporate cases.  Barry has an "AV Preeminent" peer review rating from Martindale Hubbell with a 5.0, the highest possible score. He has also been selected as a 2010, 2011, 2012 and 2013 "Super Lawyer" in New York by Superlawyers.com.

Barry and his wife Sharon have lived in New City for the last 14 years. Their two younger children attend Woodglen Elementary and Felix Festa Middle School. Barry's oldest son is a teacher at the Charter Equality Middle School in the Bronx, and his oldest daughter is now a senior at the University of Pennsylvania.