Eugene Patrick John McCarthy OBE (20 November 1916 - 8 April 2009), also known professionally for most of his career as John Mac or simply Mac, was a three-times Grammy Award-nominated[1] director and conductor of choral music.

He later worked at a bank, and in 1940 was married to Margaret Quigley with whom he had twin girls and a son.

[3][2] After serving during the Second World War, he studied privately under Mátyás Seiber, a prominent composer and conductor, and also sang professionally as a tenor around the same time.

[2] In the mid-1960s McCarthy moved into opera music, and worked with artists such as Joan Sutherland, Placido Domingo and Luciano Pavarotti.

2 in C Major,[7] and one in 1976 for conducting a rendition of Cherubini's Requiem in D Minor,[8] all in the "Best Classical Choral Performance" category.