Malory Archer is Sterling Archer's mother and the head of ISIS. She's self-center, narcissistic and possibly the worst mother on the planet. Oh and a raging alcoholic. Guess that's where Sterling gets it from.
She's a former black ops agent and will do anything to stop her son from ending up with Lana. She has had notable affairs with the head of rival agencies ODIN and the KGB. Heck, one of those dudes is most likely Sterling's father.