Simon & Schuster has named a former Amazon.com executive, Greg Greeley, as its new CEO. The publisher announced Monday that Greeley’s appointment is effectively immediately. The 62-year-old Greeley succeeds Jonathan Karp, who announced last year that he was stepping down. Greeley has a background in business and investment. He spent nearly 20 years at Amazon, where his positions included vice president of Amazon Prime. Greeley will be running Simon & Schuster at a time of rapid change in the industry, with publishers, authors and agents debating the role of AI in the future of books.