Parker was educated at Churchill College , Cambridge where he studied natural sciences . He joined the Security Service in 1983 . He was seconded to HM Customs and Excise as Director Intelligence in 1999 before becoming Director , International Terrorism at the Security Service in February 2005 . After leading the Security Service 's response to the 7 July 2005 London bombings and the 2006 transatlantic aircraft plot , he became Deputy Director General in 2007
7 July 2005 London bombings
7 July 2005 London bombings
Andrew Parker (MI5 officer)