Michael Ralph "Mo" Foster (22 December 1944 – 3 July 2023) was an English multi-instrumentalist, record producer, composer, solo artist, author, and public speaker. Through a career spanning over half a century, Foster toured, recorded, and performed with dozens of artists, including Jeff Beck, Gil Evans, Gary Moore, Phil Collins, Ringo Starr, Joan Armatrading, Gerry Rafferty, Brian May, Scott Walker, Frida of ABBA, Cliff Richard, George Martin, Van Morrison, Dr John, Hank Marvin, Heaven 17, Véronique Sanson and the London Symphony Orchestra. He released several albums under his own name, authored a humorous book on the history of British rock guitar, written numerous articles for music publications, continued to compose production music, and established himself as a public speaker.
