Patrick Leonard

Patrick Raymond Leonard (born 1955 or 1956) is an American songwriter, keyboardist and music producer, known for his longtime collaboration with Madonna on many different recordings. He gained his entry into the music business with late 1970's Chicago, Illinois-based pomp rock band Trillion, which was also notable for featuring future Toto singer Dennis "Fergie" Frederiksen on lead vocals. Patrick is notable for the breadth of material he has worked with, including late-period Pink Floyd and solo Roger Waters, as well as Boz Scaggs, Peter Cetera, Elton John, Jody Watley and Rod Stewart.

He gained his entry into the music business with late 1970's Chicago, Illinois-based pomp rock band Trillion, which was also notable for featuring future Toto singer Dennis "Fergie" Frederiksen on lead vocals.

Patrick is notable for the breadth of material he has worked with, including late-period Pink Floyd and solo Roger Waters, as well as Boz Scaggs, Peter Cetera, Elton John, Jody Watley and Rod Stewart. He also was half of the art-pop group Toy Matinee with the late Kevin Gilbert and Third Matinee with Richard Page.

source: http://en.wikipedia.org/wiki/Patrick_Leonard