Arafed man sitting in a chair in a library with a bookcase

A photo of Oppenheimer sitting at his desk, surrounded by stacks of papers and books, deep in thought.,World War II,J. Robert Oppenheimer was a slender, sharp-featured man, often seen with a cigarette in hand, which complemented his contemplative demeanor. He had deep-set eyes and a prominent nose, which, alongside his habitual wearing of a pork pie hat, gave him a distinctive silhouette.