Matt Fink (born February 8, 1958), better known as Dr. Fink, is a keyboardist, producer, and songwriter best-known for playing keyboards in Prince's band, The Revolution. At Prince concerts, he was distinguished onstage for performing dressed in a surgical mask and scrubs. He has also worked with artists, songwriters and producers, including The Time, Lipps Inc., The Jets, Vanity 6, David Z., Bobby Z., P. Diddy, The Rembrandts, Phil Solem, PC Munoz, 7 Aurelius, Steve Nathan, Shock G, Kris Vanderheyden Bray, Criss Starr, and Marc Mozart.
https://en.wikipedia.org/wiki/Doctor_Fink