Egon Orowan FRS (Hungarian : Orován Egon) (August 2, 1902 – August 3, 1989) was a Hungarian - British physicist and metallurgist. He was key in introducing crystal dislocation into physics and understanding of how materials plastically deform under stress. According to György Marx, he was one of The Martians, a group of Jews born in Pest between 1890 and 1910 who shaped the 20th century's technology after moving to the West.