In 1984, she took the role of, “Mona Robinson,” on the sitcom Who's the Boss? with Judith Light, Alyssa Milano, Danny Pintauro, and Tony Danza. The show was a ratings success, running for eight seasons and finishing in the Nielsen "Top 10" four straight years.
In 1992 she portrayed Honor Zetterland, mother of the titular character in Inside Monkey Zetterland. Her character was an aging soap star who was being phased out of her own show on which she had starred for 30 years.
In 2003 she appeared in Beethoven's 5th.
She had also appeared in the 1975 television movie The Legend of Lizzie Borden as Emma Borden.
She was nominated for an Emmy for her role on Soap four times in a row (1978–1981) as Best Actress in a Comedy Series. In 1988 and 1989 she was nominated as Best Supporting Actress in a Comedy Series for her role on Who's the Boss?. In 2002 she was nominated as Guest Actress in a Comedy Series for her role in Everybody Loves Raymond.
In 1957, Helmond married George N. Martin. After their divorce she married her second husband, David Christian; the two have been together since 1962; they have no children. They have owned homes in Los Angeles, New York City, Long Island and London.
RE-ENTER, STAGE LEFT KATHERINE HELMOND, STRONG-MINDED VETERAN OF THE SMALL SCREEN, RETURNS TO THE THEATER IN ` 'NIGHT, MOTHER'
Jan 30, 1998; NEW YORK -- It's not unusual to expect actress Katherine Helmond to sail into a room with a gust of giggles, wearing some smartly...