English multi-instrumentalist and producer who shaped progressive rock and electronic music through his work with major acts spanning five decades. Stewart co-founded Strawberry Studios in Stockport during the late 1960s, establishing a creative hub that became instrumental in advancing studio production techniques and electronic music experimentation throughout the 1970s and 80s.
Beyond his studio work, Stewart contributed as a guest vocalist to Alan Parsons Project's synth-driven "Freudiana" (1990) and collaborated on subsequent Parsons releases, bringing his distinctive voice to electronic and prog-influenced compositions. His production expertise and multi-instrumental capabilities helped bridge traditional songwriting with emerging electronic production methods, making him a significant figure in the evolution of studio-based music creation.