The Atom aka Dr. Ryan Choi was born in Kowloon, Hong Kong and is currently a professor of nuclear physics at Ivy University. When he began working at Ivy University, Choi received the Bio-Belt from a fellow colleague. With the belt, Choi quickly discovered he could manipulate his height from his full size to the subatomic scale while retaining any mass, weight, and density. As the Atom, he set out to explore the microscopic world and use the belt for the advancement of society while filling the void left by Ray Palmer's retirement. Atom also used his ability to shrink an array of scientific instruments and keep them in his belt, including a swab, microscope, electromagnetic discharge gun, and field pressurizer. Despite his career as a super hero, the Atom preferred to use logic and science