Roy J. Bittan (born July 2, 1949) is an American keyboardist, best known as a member of Bruce Springsteen's E Street Band, which he joined on August 23, 1974. Bittan, nicknamed The Professor, plays the piano, organ, accordion and synthesizers.
Aside from his membership in Bruce Springsteen's band, Bittan has played on several dozen albums as a session musician primarily for notable singer-songwriters, and rock and pop artists. Some of the prominent musicians with whom he has recorded include Jon Bon Jovi, David Bowie, Jackson Browne, Tracy Chapman, Chicago, Catie Curtis, Dire Straits, Peter Gabriel, Ian Hunter, Meat Loaf, Stevie Nicks, RVIVR, Bob Seger, Celine Dion, Nelly Furtado, Patty Smyth, Jim Steinman, and Bonnie Tyler.