Southampton etcher born in Swaythling, Southampton who studied at the Royal College of Art receiving his Diploma in 1929 and furthered his studies at the Ecole des Beaux-Arts in Paris during 1929–1930. Between 1924–1935, Mcnab exhibited at the Royal Academy, Beaux Arts Gallery, Chenil Gallery, Abbey Gallery, Fine Art Society, Goupil Gallery, New English Art Club, the Royal Scottish Academy, Royal Glasgow Institute of Fine Arts and the Walker Art Gallery in Liverpool. He produced a small body of prints during the 1920s and early 1930 and a series of line engravings by him were used in poster advertisements for Johnnie Walker whisky. A wood engraving entitled 'Landscape' by McNab is illustrated in Artwork, January 1926. In the 1930s, McNab moved to the USA and from 1938 to 1945 was the design director for Norman Bel Geddes (1893–1958) who was an American theatrical impresario and aeronautical design engineer.