From a New York Times obit by Neil Genzlinger headlined “Liz Sheridan, Who Played Jerry Seinfeld’s Mom, Dies at 93”:

Liz Sheridan, a stage, film and television actress best known for playing Helen Seinfeld, Jerry’s mother on the acclaimed sitcom “Seinfeld,” died on Friday at her home in New York City.

Ms. Sheridan started her career as a dancer in the 1950s. Her acting career blossomed in the 1970s, when she appeared in seven Broadway shows (one, “Happy End” in 1977, also featured Meryl Streep, still early in her career) and on an episode of the TV series “Kojak.”