During his career as a prosecutor, Christopher worked with federal agents at over a dozen separate federal agencies. He was instrumental in helping to obtain a number of convictions for them at the state level. Through his years as a prosecutor, he worked on numerous cases with the former U.S. Immigration & Naturalization Service (I.N.S.), but also with the Department of Homeland Security (D.H.S.) Special Agents assigned to the new Office of Immigration & Customs Enforcement (I.C.E.), the Special Agents from the Federal Bureau of Investigations (F.B.I.), the Drug Enforcement Administration (D.E.A.), the U.S. Secret Service (U.S.S.S.), the U.S. Department of the Treasury (D.O.T.), the U.S. Postal Service Inspectors Office (U.S.P.S.), the Transportation Security Administration (T.S.A.), the Bureau of Alcohol, Tobacco, Firearms and Explosives (A.T.F.), the U.S. Marshals Service (U.S.M.S.), the Department of Justice (D.O.J.) and the federal prosecutors with the U.S. Attorney’s Office (U.S.A.).