There is no way to introduce the specific resume one by one. The Secret Service needs to be nominated by the President and approved by Congress. Most officials are usually veterans or policemen or work for other law enforcement agencies. For example, julia pearson was a patrolman in Orlando before 1983 joined the Secret Service. Before joining the Secret Service, her predecessor, Mark Sullivan, was an inspector in the Inspector's Office of the United States Department of Housing and Urban Development. The so-called inspector's office is a supervisory body set up by most cabinet departments and independent departments of the US government. His agent is similar in nature to that of law enforcement agencies. Ralph Bassam joined the Secret Service in 1970s, engaged in security work and investigation (two functions of the Secret Service). After 90, he became the training center of law enforcement department and the head of transportation safety bureau. He returned to the Secret Service in 2006 and was appointed as the director by George W. Bush.