op·er·a·tor

/ˈɑːpəˌreıtɚ/ noun, pl -tors [count]

1 : a person who uses and controls something (such as a machine, device, or business) : someone who operates something

a computer/crane operator

the operator of an automobile

the operator of a nuclear power plant

2 : a person whose job is to help to connect telephone calls : a person who is in charge of a telephone switchboard

Call the operator for the phone number.

Operator, please connect me with extension 123.

3 : a person who is able to easily achieve things especially by persuading people or by being dishonest

She's quite an operator–no one else could have gotten them all to agree to the project.

a smooth operator