who is "michael j. fox"?
Canadian-American actor, comedian, author, film producer, and activist.
Michael J. Fox
Michael Andrew Fox (born June 9, 1961), known professionally as Michael J. Fox, is a Canadian-American actor, comedian, author, film producer, and activist with a film and television career spanning from the 1970s. 
who sang johnny b good in back to the future UNANSWERABLE
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Michael J. Fox [SEP] Introduction
Michael Andrew Fox (born June 9, 1961), known professionally as Michael J. Fox, is a Canadian-American actor, comedian, author, film producer, and activist with a film and television career spanning from the 1970s. He starred in the "Back to the Future" trilogy in which he portrayed Marty McFly. On television, he played Alex P. Keaton on the American sitcom "Family Ties" (1982–1989) and Mike Flaherty on the ABC sitcom "Spin City" (1996–2000). He has won five Primetime Emmy Awards, four Golden Globe Awards, a Grammy Award, and two Screen Actors Guild Awards. Fox was diagnosed with Parkinson's disease in 1991 at age 29, and disclosed his condition to the public in 1998.