Wallace Voughan was a particle physicist for NASA's Langley Research Center in Hampton, Virginia. He had been hired in 1998 and worked until he disappeared on July 14, 2005. That day, Voughan had told his supervisor that he needed to leave work at 3 PM instead of his usual 5 but did not give an explanation as to why. His supervisor agreed because Voughan almost never asked to leave early and was considered one of the Research Center's top employees. Voughan formally signed out at 2:58 PM, which is the last time he was ever seen.