With mentors having included artists as diverse as Robert Mitchell and John Taylor, his piano work has covered a huge range of touchstones across the jazz, contemporary and world music spectrums. Alexander’s repertoire features improvisations on and interpretations of hymns, gospel songs, African-American spirituals, Bach chorales, sacred music from world music traditions – and more, including his own music.

Over the past 15 years he has worked with some quite outstanding musicians - including several who have now become serious recording artists in their own right - Clark Tracey, Orlando Le Fleming, Jeremy Brown, Winston Clifford, Robert Fordjour, MOBO Award-winners Adam Waldmann and Nathaniel Facey, Arun Ghosh, Brigitte Beraha and several more. His solo jazz piano concert at the 2007 Manchester Jazz Festival was described as a 'masterclass' (Jazzwise).

In 2011 he received the Jazz Factor Artist Development Award specifically for his solo piano work in sacred jazz, and as part of that he undertook his first-ever solo piano tour of the UK playing churches, cathedrals and other venues in England, Wales and Scotland (including the 2011 Glasgow Jazz Festival). In December 2012 he was commissioned to write a solo jazz piano suite for Spark and Echo Arts in New York. Having taken a two-year sabbatical from jazz piano in order to focus on other interests, in 2015 he is returning to solo and trio playing, with larger ensembles to follow.