Ernest Oppenheimer, according to a South African History website was instrumental in creating a cartel that eventually controlled the diamond price after the First World War. This memorial tablet can be seen at the Queen Elizabeth House along St. Giles Street in Oxford. Another famous Oppenheimer, however, notorious is physicist, Robert Oppenheimer. Robert is credited for the Manhattan Project. The Manhattan Project is a WWII effort to develop nuclear weapons. He (Robert O.) is also colloquially known as the "father of the atomic bomb."