Irving D. Isko, 87, of Mendham died March 20, 2015. He was born in New York City.
After starting his career at Berliner Law Firm, Mr. Isko worked at Philipp Brothers and then at Engelhard Minerals and Chemicals before finishing his career as president and chief executive officer of Engelhard Corporation.
He graduated from Cornell University and Harvard Law School.
He is survived by two daughters, Laura and Susan; his son, Steven; and two granddaughters.
Services were held March 22 with arrangements by Bernheim-Apter-Kreitzman Suburban Funeral Chapel, Livingston.