The obits that are already out there do a good job of covering his life (the short version: go watch Awakenings and read his stuff), so I’ll just add this. Sacks’ writing and speaking about his cancer, treatments, and looming death are as clear-eyed and well written as any I’ve read. Here’s his last piece, from earlier this month in the Times (he had others in the paper over the past few months, all of which are worth reading).