Egon Orowan FRS (Hungarian: Orován Egon) (2 August 1902 – 3 August 1989) was a Hungarian-British physicist and metallurgist.[1][2][3] He was key in introducing crystal dislocation into physics and understanding of how materials plastically deform under stress.[3][4] 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.[5][6]