It is rare when the Oil company owns the rig, those days have gone by. The Deepwater Horizon is owned by Transocean, working for BP. BP had people on board the rig. The majority of the basic drilling work is done by Transocean employees, there are some specialized work that is typically done by other contractors, i.e. Halliburton, Schlumberger, Cameron, etc. There is always a BP Supervisor and Transocean supervisor. The "captain of the ship" is a Transocean employee, however there were no less than three people in a "supervisory position" who could have/should have changed the process, 1 BP, 2 TO.