Anthony Zuppero is an American nuclear scientist who is noted for his work in nuclear thermal rockets using water as the propellant. Early in his career he worked on nuclear weaponry, including one proposal to try to move a 1 gigatonne nuclear bomb to Russia in under two minutes, which he was able to show was impractical. "Just before he left the Idaho National Engineering and Environmental Laboratory, Department of Energy, where he worked from 1991 through 1998, he was the (de facto) Principal Investigator, Nuclear Space Transport Systems."