SEATTLE — In 2002, Andy Jassy, a young executive at Amazon, began closely shadowing Jeff Bezos, the founder of the online bookstore.Mr. Jassy followed Mr. Bezos everywhere, including board meetings, and sat in on his phone calls, said Ann Hiatt, who was Mr. Bezos’ executive assistant from 2002 to 2005. The idea, she said, was for Mr. Jassy to be “a brain double” for Mr. Bezos so that he could challenge his boss’s thinking and anticipate his questions.“I thought that I had very high standards before I started that job,” Mr. Jassy said in a podcast interview last fall about the 18 …
