Peter Elijah Jonathan Mason (born Peter Robert Ness) is a British politician and town planner who, since May 2021, is the leader of Ealing London Borough Council.[1] He was first elected to Ealing Council in 2014 and was previously Ealing's Cabinet Member for Housing, Planning & Transformation and, from 2013 to 2021, First self-described convert to Judaism to be National Secretary of the Jewish Labour Movement.[2] [3] He is the former director of London Jewish Forum. Following a report by former Liberty director Shami Chakrabarti that recommended a transfer of powers to the Labour's National Constitutional Committee (NCC), he was elected to the NCC (which now handles disciplinary cases), the first convert to Judaism to be elected to a national committee in the UK Labour Party.[4]