in which activism is he involved?
His foundation, The Michael J. Fox Foundation, was created to help advance every promising research path to curing Parkinson's disease.
Michael J. Fox
 His foundation, The Michael J. Fox Foundation, was created to help advance every promising research path to curing Parkinson's disease, including embryonic stem cell studies. 
who sang johnny b good in back to the future UNANSWERABLE who is "michael j. fox"? Canadian-American actor, comedian, author, film producer, and activist.
wiki:13433136
Michael J. Fox [SEP] Health and activism
Fox started displaying symptoms of early-onset Parkinson's disease in 1991 while shooting the movie "Doc Hollywood", and was diagnosed shortly after. After his diagnosis, Fox started drinking heavily and suffered from depression. He eventually sought help and stopped drinking altogether. In 1998, he decided to go public about his Parkinson's disease, and since then, he has been a strong advocate of Parkinson's disease research. His foundation, The Michael J. Fox Foundation, was created to help advance every promising research path to curing Parkinson's disease, including embryonic stem cell studies. Since 2010, he has led a $100 million dollar effort, which is the Foundation's landmark observational study, to discover the biological markers of Parkinson's disease with the Parkinson's Progression Markers Initiative (PPMI).