He has gained widespread exposure as co-leader, arranger and pianist with vocalist Tierney Sutton, although he has also maintained a substantial career as a solo artist and leader.

During his years in Boston, he formed "Bostonian Friends", a musical partnership with Swiss saxophonist Fritz Renold, which produced jazz recordings ("Starlight" 1996) and classical commissions ("The 6 Cycles" with the Thai Symphony Orchestra 1999, and "Helvetic Suite" 1998).

From 1992 to 1994, Jacob also served as Director in Residence of the "Orchestre Regional Jazz de Lorraine" in Nancy, Meurthe-et-Moselle, and composed their inaugural commission.

This led to Ferguson producing Jacob's first piano trio record, featuring John Patitucci and Peter Erskine.

Jacob has extensive credits as a sideman, including Phil Woods, Michael Brecker, Randy Brecker, Flora Purim, Airto Moreira, Terje Gewelt, Carl Saunders and others, but his most visible association has been as co-leader and pianist for Telarc recording artist Tierney Sutton.

Unsung Heroes, Blue in Green, Something Cool, Dancing in the Dark, I'm with the Band, On the Other Side, Desire and American Road.

In 2012 Christian and The Tierney Sutton Band received two Grammy nominations for American Road, Best Jazz Vocal Album and Best Arrangement Accompanying a Vocalist.

His arranging credits include writing for Randy Brecker, Franco Ambrosetti, Benny Golson, Gary Burton, Tommy Smith and The Scottish National Jazz Orchestra, Jazzaar (The Swiss Youth Jazz Orchestra) and his own big band "Big Band Theory".