a person who exercises control over workers; "if you want to leave early you have to ask the foreman"
The head lighting technician in a film or video crew Implements the lighting plans of the Director of Photography and is responsible for set power requirements
People use gaffer to refer to the the person in charge of the workers at a place of work such as a factory. The gaffer said he'd been fined for not doing the contract on time. = boss
[ 'ga-f&r ] (noun.) 1575. From Middle English gaffe (“a hook”) + -er. The natural lighting on early film sets, was adjusted by opening and closing flaps in the tent cloths, called gaff cloths or gaff flaps.