S: (n) den mother (someone who plays the role of a den mother) "he serves as den mother to all the freshmen in this dormitory"; "she's the den mother to new secretaries"
S: (n) stage manager, stager (someone who supervises the physical aspects in the production of a show and who is in charge of the stage when the show is being performed)
S: (n) system administrator (a person in charge of managing and maintaining a computer system of telecommunication system (as for a business or institution))