FAIRFIELD-SUISUN, CALIFORNIA New 5th District Supervisor Mitch Mashburn takes the oath of office during the Solano Board of Supervisors meeting, Tuesday, Jan. 5, 2021. (Robinson Kuntz/Daily Republic) Vasquez to lead Board of Supervisors; Mashburn newest member FAIRFIELD — Supervisor Erin Hannigan, having taken her oath to start a third four-year term, was all but giddy about stepping away as the board chairwoman. “Oh, trust me, this is a happy day,” Hannigan said as Supervisor John Vasquez was selected unanimously as the new chairman for 2021. Supervisor John Vasquez Supervisor Erin Hannigan This is the sixth time Vasquez has served as chairman. He also held the post in 2006, 2009, 2010, 2017 and 2018.