Alden Ehrenreich is being celebrated for giving one of the best performances in Oppenheimer. Portraying a nameless Senate aide to Robert Downey, Jr.'s Lewis Strauss, nobody went into the movie expecting him to shine as brightly as he does. He steals every scene he's in, as his naïveté and reactions to the horrors he's seeing mirror those of the audience. Not only that, but he gets to drop one of the film's best lines at the end. However, this isn't the first time the young actor has held his own amid a truly star-studded ensemble -- nor is it the best.
Source：https://www.cbr.com/alden-ehrenreich-oppenheimer-performance-coen-brothers-hail/
