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In 1985 MacHale published "George Boole: His Life and Work", the first book length biography of Boole. In 2014, a year ahead of Boole's bicentennial, this was reissued in revised and expanded form as "The Life and Work of George Boole: A Prelude to the Digital Age". He is considered the world's leading expert on Boole and in 2018 published another book "New Light on George Boole", co-authored with Yvonne Cohen.