Kellermann graduated from Randolph College with a Bachelor of Arts degree in English literature.
[1] She also studied acting at the Neighborhood Playhouse School of the Theatre with Sanford Meisner.
[1] She made her television debut in episodes of Starsky and Hutch (1975) and Laverne & Shirley (1976).
She also appeared in three episodes of Taxi as Greta Gravas, mother of the character Latka.
She made her Broadway debut in 1979 in the play Last Licks for which she received a Theatre World Award.