It's mentioned at the end of the article. > Oliver Sacks, who died in 2015, was the author of many books, including “Musicophilia,” “Gratitude,” and “The River

It's mentioned at the end of the article. > Oliver Sacks, who died in 2015, was the author of many books, including “Musicophilia,” “Gratitude,” and “The River of Consciousness.” A final collection of his essays, “Everything in Its Place,” will be published in April.