Born and raised in New Jersey, Keith's formal composition studies began in 1990, when he attended a student composition summer seminar at Westminster Choir College. He received a Bachelor of Music in Composition from Temple University in 1994, where he studied with Maurice Wright and Matthew Greenbaum and piano with Charles Abramovic. He also studied audio engineering. He received his Master of Music in Composition from Temple in 1996, where he was a graduate fellow and taught computer music. Keith's first experience of Catholic music ministry was as choir director for the Temple University Newman Center for four years. He was a delegate to the 1994 World Youth Day celebration in Rome, at which he represented the Catholic Campus Ministry Association. After moving to Illinois, Keith was director of the contemporary choir at St. Luke's Church in River Forest for three years.
Keith joined the editorial staff at World Library Publications in 2001. As a music editor, his responsibilities include editing of octavos, songbooks, and instrumental music. He lends his production and performance skills to various WLP recordings.
In addition to his work with WLP, Keith is active in his parish, Ascension Church in Oak Park, as assistant choir director, and is on music staff at St. John of the Cross in Western Springs. He is a member of the National Association of Pastoral Musicians, where he has also been a presenter and board member of the Chicago chapter. Keith lives in Oak Park, Illinois, with his wife, Clare, sons Sebastian and Xavier and daughter Rose.