Claim: Michael McCullers was employed with Sigourney Weaver.
Evidence: He is the writer and director of the 2008 comedy Baby Mama starring Tina Fey and Amy Poehler.
Baby Mama is a 2008 American romantic comedy film written and directed by Michael McCullers in his directorial debut and starring Tina Fey , Amy Poehler , Greg Kinnear , Dax Shepard , Steve Martin and Sigourney Weaver.