Michael J. Fox, star of "Back to the Future", has been living with Parkinson's disease since 1991. In an interview with Variety, he discussed the physical injuries he has suffered as a result of the disorder, and his efforts to manage it and enjoy life. He has also become an advocate for Parkinson's research and awareness, founding the Michael J. Fox Foundation for Parkinson's Research in 2000, which has raised over $800 million.