Michael J. Fox was just 29 years old and at the peak of his acting career when he was diagnosed with Parkinson’s disease, but he continued to work in movies and television before stepping away to create his now-famous research foundation. In this week’s “Sunday Sitdown,” Willie Geist gets together with Fox to talk about his new book “No Time Like the Future” in which he reveals a recent breaking point in his 30-year fight against the disease.