Read the following premise and answer if the hypothesis is true.
Tony Sanchez, also known as Spanish Tony (died 2000), was a British photographer of Spanish ancestry. He worked as Keith Richards' assistant for eight years and co-wrote with John Blake a bestselling memoir about this time, entitled "Up and Down with the Rolling Stones: My Rollercoaster Ride with Keith Richards" (1979).
Hypothesis: Tony wrote his memoir over 20 years before passing away.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
Yes
Yes.