For her performance on Knots Landing, she won the Soap Opera Digest Award for Best Actress in 19. In 1978, Van Ark landed her most famous role of Valene Ewing, who first appeared on the CBS series Dallas, then was a leading character for 13 seasons on its spin-off Knots Landing (1979–92). In 1971, she received a Theatre World Award and was nominated for the Tony Award for Best Featured Actress in a Play for the revival of The School for Wives.
A life member of The Actors Studio, she made her Broadway debut in 1966 in Barefoot in the Park. She is best known for her role as Valene Ewing on the primetime soap opera Knots Landing. Joan Van Ark (born June 16, 1943) is an American actress.