More than half a century ago, there were 4, 000 drive-in movie theaters in the United States, and watching a movie from your car was a popular way to spend an evening. But with the number of drive-ins reduced to just a few hundred, outdoor movie has been popping up across the nation. Going to an open-air theater has become a modern summer pastime for an increasing number of movie fans. In recent years, outdoor movie screenings have come up in parks, vacant lots and shopping malls around the nation. On average, about 1,000 people attend each movie night. It attracts a lot of young professionals, young workers and residents nearby. For some, the outdoor movies bring back the memories of the drive-in theaters of their youths. But for the majorities, they think it is comparable to the atmosphere of drive-ins, as they can bring friends, food, good wine, and watch the movie together. The returning of Americans' love affair with outdoor movies makes Stephen Bastas ever busier. His seven-member crew sets up screens in various locations mostly in the Washington area every day throughout the summer. They are doing pretty well and they hope to continue the trend. And it looks like they are going to. That's because many fans say there is nothing like watching a movie on a breezy summer evening under the stars. From the text, we can learn that Stephen Bastas is most probably   _  .
a movie maker an outdoor movie fan a movie director an open-air theater operator