The Foreman in charge of drilling rig operations and crew members.
The name given to the chief engineer of a drilling crew, the man with overall responsibility for the rig in the field.
an employee of a drilling contractor who is in charge of the entire drilling crew and the drilling rig. Also called a drilling foreman,, rig manager, rig superintendent, or rig supervisor. 
Second-in-command of a drilling crew under the drilling superintendent. Responsible for the day-to-day running of the rig and for ensuring that all the necessary equipment is available.