Leonard Rosenstein, a civil litigator in Essex County known for his trial and appellate skills, died April 24. He was 84.

Rosenstein, who had a reputation for mentoring younger lawyers and being able to give case citations off the top of his head, primarily focused on defense matters but also did some plaintiff work.

One of the cases he argued successfully on appeal was Collopy v. Newark Eye and Ear Infirmary, 27 N.J. 29 (1958), which abolished the common-law doctrine of charitable immunity until the Charitable Immunity Act was passed a year later.

Rosenstein graduated from Rutgers University in 1949 and Cornell Law School in 1952, and spent the next two years in the U.S. Air Force, serving as a first lieutenant.

He worked for the Federal Housing Administration from 1954-55 and at his father’s practice, George H. Rosenstein in Newark, from 1955-60. He then worked with William Furst in Newark, 1960-65; Max Sherman in Springfield, 1965-68; Feuerstein, Sachs, Maitlin, Rosenstein & Fleming in West Orange (now Sachs, Maitlin, Fleming & Greene), 1968-85; Margolis Chase in Verona, counsel, 1986-91; Hurley and Vasios in Short Hills (now Vasios, Kelly & Strollo), counsel, 1991-2008; and Braff, Harris & Sukoneck, Livingston, counsel, 2008.

He was a master in the Brennan Inn of Court. In addition to practicing in New Jersey, Rosenstein was admitted to practice in New York and before the U.S. Supreme Court and the U.S. Court of Appeals for the Third Circuit.

A former resident of Livingston, he lived in Sandy Springs, Ga. •