He was one of the scientists that was sent to work for the U.S. Navy, on Operation Crossroads, that was conducted at the Bikini Atoll in 1946. Aside from testing an atomic bomb during the operation, he also collected a variety of flora and fauna on the Marshall Islands. In 1947 he returned to the site which was a part of Bikini Resurvey, during which he found even more species for his collection.[2]
Starting from 1958 till 1967, he spent much time studying shark attacks. It was a part of a study that was funded by the U.S. Navy, in order to reduce the incidents of attacks. He maintained an International Shark Attack File, that was used to record data about shark attacks on humans. The file is still used today for the same purpose it was designed, and is used by Florida Museum of Natural History.[2]
During his life, Schultz wrote and published many articles and books. He used to serve as a zoologistemeritus at the Smithsonian Museum, until he died in 1986.[2]