Obi Wan Kenobi on Tatooine after the events of Episode III. Almost all of the Jedi were killed by Order 66, and most of the survivors were killed in the Great Jedi Purge that followed. The Jedi Order survived through acts of surviving Jedi, such as Obi-Wan Kenobi and Yoda, teaching Luke Skywalker the ways of the Force.
"I just did my best to depict what I thought the film should look like, I really liked the idea. I didn't think the film would ever get made. My impression was it was too expensive. There wouldn't be enough of an audience. It's just too complicated. But George knew a lot of things that I didn't know." —McQuarrie on Star Wars.