When did a previous president and chief executive of TNK-BP replace Tony Hayward?
Tony Hayward:  His tenure ended on 1 October 2010 when he was replaced by Bob Dudley following the "Deepwater Horizon" oil spill. Bob Dudley: Robert Warren "Bob" Dudley (born September 14, 1955) is the group chief executive of BP. Bob Dudley:  He had served as president and chief executive of TNK-BP and on June 18, 2010, was assigned to be BP executive in charge of the Gulf Coast Restoration Organization responding to the Deepwater Horizon oil spill.
1 October 2010