Irving Lambert (1961–2008), was a United States Army colonel, Director of Third Echelon, Operations Coordinator of the "Splinter Cell" program and the primary handler during Sam Fisher's time at Third Echelon. While in the position, his role was to guide Fisher through each mission over the cochlear implant radio, providing him with information such as critical updates, objective changes, and enemy status. He was also one of Sam's closest friends.