Shriver, 59, is a son of the late Eunice Kennedy Shriver — sister of President John F. Kennedy — and the brother of Maria Shriver, the estranged wife of former Governor Arnold Schwarzenegger. He served on the Santa Monica City Council from 2004-12.
Former State Senator Sheila Kuehl has already declared for the seat, currently held by Zev Yaroslavsky, who is termed out this year. Kuehl, 72, already has raised nearly $500,000 for the campaign. In 1994, she was the first openly gay person to be elected to the California legislature.
Yaroslavsky represents the 3rd District on the five-member board. The Westside district stretches from Santa Monica to the San Fernando Valley. The board controls a $25 billion budget and oversees public hospitals, the foster care system, the probation department and an array of other social services in the county. It also determines funding for the Sheriff’s department.
Former Malibu Mayor Pamela Conley Ulich and West Hollywood City Councilman John Duran are also candidates.
The primary election for the non-partisan office is in June.
Correction: An earlier version of this story incorrectly said Zev Yaroslavsky represents L.A. County's 2nd District.