Norris Dewar McWhirter was a British writer, political activist, co-founder of The Freedom Association, and a television presenter. He and his twin brother Ross were known internationally for founding the reference book The Guinness Book of Records which they wrote and annually updated together between 1955 and 1975. After Ross's assassination by the Provisional Irish Republican Army (IRA), Norris carried on alone as editor.

Alan Ross McWhirter was, with his twin brother, Norris, the cofounder of the 1955 Guinness Book of Records and a contributor to the television programme Record Breakers. He was assassinated by the Provisional Irish Republican Army (IRA) in 1975.