Safely harnessing the power of the atom to produce energy or to diagnose and treat medical problems is the work of the nuclear engineer. As a nuclear engineer, you may work on nuclear reactors that generate power for large cities, submarines, or even space ships. Your work may involve researching the nuclear fuel cycle from production to the safe disposal of nuclear waste. Or you might explore the development of fusion energy. Or you might work in nuclear medicine, developing machines that image the human body and destroy cancer cells.