In the world of Hollywood, the creation of the perfect hat for a character can be crucial to defining their look and persona on screen. In the case of the film "Oppenheimer," depicting renowned physicist J. Robert Oppenheimer, the meticulous crafting of his signature hat became a significant endeavour. Mark Mejia, owner of Baron Hats, played a pivotal role in this process, ensuring that the hat not only resembled Oppenheimer's iconic style but also captured the essence of the character.