Oil rig jobs include semi-skilled workers who operate on the rig deck, specialists who work on machinery for drilling, and drillers and assistants who handle the controls of the drill in a control room. On offshore rigs, crews may include medics, mechanics, welders, and cooks. Management-level staff on oil and gas industry rigs include tool pushers, who work in the rig office, and offshore installation managers, whose duties involve overseeing the entire rig operation. Geologists who work on an oil rig collect samples during operations, otherwise known as “mud logging.”