He gave his debut broadcast organ recital at the age of 19 in Westminster Cathedral, having become a Fellow of the Royal College of Organists at 18.
Awards included Cambridge University's John Stewart of Rannoch Scholarship in Sacred Music and 'Greater London Arts Association Young Musician 1975'.
[1] Here he has given more than 400 of the weekly lunchtime organ recitals, and continued the musical traditions of such predecessors as William Boyce (the 18th-century composer) and Harold Darke.
[2] There are several CDs, including a choral disc of music by George Dyson in which Rennert conducted St Michael's Singers and the Royal Philharmonic Orchestra.
His writings include biographies of the infant prodigy and composer William Crotch (1975)[3] and of the organist George Thalben-Ball (1979).