Linda Hunt stars as Hetty Lange on NCIS: Los Angeles.
She's in charge of the technology that Henna and Callen use on the show. She's pretty much like the Q to their James Bond.
(To Nate as he leaves) Keep you wits sharp, your heart open and your gun loaded.Hetty
Callen: Is there a military angle to any of this?
Hetty: No, but Detective Deeks is still the Liaison Officer with the LAPD, which makes him about as close to one of us as it gets.