Now retired, Bill Johnson has taught heating, air conditioning, and refrigeration for more than two decades in various technical colleges and factory schools. A graduate of Southern Technical Institute, a branch of Georgia Tech in Atlanta, Georgia, he has also served as Service Manager for a major manufacturer for six years.

Mr. Johnson owned his own HVAC/R business for 10 years and has been a member of the Refrigeration Service Engineers Society and the American Society of Heating Refrigerating Air Conditioning Engineers.

His authoring credits include three major textbooks on the market today as well as their ancillary materials. He also writes a monthly article - BTU Buddy - that is available online.

Andrew Murray has been Chief of Staff of Unite union since 2011, and was previously its Director of Communications. He was Chair of the Stop the War Coalition from 2001 to 2011, when he was replaced by Jeremy Corbyn, and again from 2015 to 2016.

From 1978 to 1984 he worked as a parliamentary and political correspondent for the Morning Star newspaper. He is the author of a number of books on history and politics, including Off the Rails: The Crisis on Britain's Railways (Verso 2001), A New Labour Nightmare (Verso 2003) and Stop the War: The Story of Britain's Biggest Mass Movement (Bookmarks 2005, with Lindsey German). He worked as part of the strategic leadership of Labour's 2017 general election campaign.