In May 2015, the borough council selected Thomas Calabrese from a list of three candidates nominated by the Democratic municipal committee to fill the vacant mayoral seat. Calabrese replaced his father, Gerald Calabrese, who was elected to the borough council in 1955 and had served continuously as mayor of Cliffside Park from 1965 until his death in April 2015, making him the longest-serving mayor in state history. In June 2015, Peter Colao was appointed to fill the vacant council seat expiring in December 2016 that had been held by Calabrese before he was selected to fill the vacancy as mayor.