Stefan Halper

Stefan A. Halper (born June 4, 1944) is an American foreign policy scholar and retired senior fellow at the University of Cambridge where he is a life fellow at Magdalene College. He served as a White House official in the Nixon, Ford, and Reagan administrations, and was reportedly in charge of the spying operation by the 1980 Ronald Reagan presidential campaign that became known as "Debategate". Through his decades of work for the CIA, Halper has had extensive ties to the Bush family. Through his work with Sir Richard Billing Dearlove, he had ties to the British Secret Intelligence Service, MI6.

Halper acted as an FBI informant during the bureau's investigation into Russian interference in the 2016 United States elections. A subsequent Inspector General report later named Halper as a "confidential human source", reporting on the conversations of officials within the Trump campaign. Provided by Wikipedia