"It's been a long week, and I've had many discussions with Parvin (Ahmadi, Pleasanton school superintendent) and a number of board members, and I am not going to be re-upping for my fourth term," Kernan said.
Kernan is currently the board's clerk and has served since the late 1990s. As an incumbent, his filing deadline was Aug. 6.
Board member Jim Ott has also opted not to run, and three people have filed for the two seats that will be vacated. Non-incumbents had until midnight Aug. 11 to file campaign paperwork.
The winners will be sworn in Dec. 14.
Jeff Bowser ran unsuccessfully for the Pleasanton school board two years ago and has announced he will try again. Bowser has a long history with the Pleasanton Unified School District, first as a teacher at Village High School, then as an administrator at Amador Valley High. He's now a manager at AT&T.
Sandy Piderit, who moved to Pleasanton in 2008, is also seeking one of the two open seats. Piderit is currently a visiting associate professor at the Naval Postgraduate School in Monterey.
Joan Laursen, president of the Pleasanton Parent Teacher Association Council, announced her candidacy in March. Laursen has been active in local school programs and fundraising campaigns. She also headed last year's effort to gain voter approval of a parcel tax and has spearheaded community fundraising campaigns.