The child of an elite pianist and teacher, and a world-class operatic baritone, Warren began playing and singing early.
His father Howard Keller, blessed with an amazingly rich voice, studied with Carlton Gauld
(http://en.wikipedia.org/wiki/Carlton_Gauld). His dear mother Roslyn, apprenticed with several luminaries: Anatole Kitain
(http://en.wikipedia.org/wiki/Anatole_Kitain), Constance Keene (http://en.wikipedia.org/wiki/Constance_Keene), and her
husband Abram Chasins (http://en.wikipedia.org/wiki/Abram_Chasins). As a teacher, 'Roz' was responsible for forming the
early careers of Joel Levine (http://www.okcphilharmonic.org/joel-levine) and Sting’s occasional accompanist, Ken Helman