William Castillo Guardado

  • Biography
  • Key Cases

William Castillo Guardado joined the firm in 2023. He brings an analytical and thoughtful approach to litigation honed through years of experience in employment, business, and human rights matters. His practice currently focuses on antitrust and consumer protection class actions. 

Previously, William was an attorney at a general civil litigation firm in the Bay Area, overseeing all aspects of cases from intake to trial. His practice areas included employment discrimination, wage and hour, business tort, and real estate litigation disputes in California federal and state courts. 

William was also an attorney at Catholic Charities Community Services in New York City, where he argued cases before the Second Circuit Court of Appeals, Board of Immigration Appeals, and immigration court. An advocate for pro bono services, he provided more than one hundred free legal consultations to members of the immigrant community in New York City and the Lower Hudson Valley.

In 2014, William was based in Tajikistan in Central Asia as an attorney with the Danish Refugee Council and the Center for Gender & Refugee Studies. He represented refugees from Afghanistan in proceedings before the UN High Commissioner for Refugees, delivered humanitarian aid, and led field research on legal protections for women and children in Central Asia. William also traveled to Afghanistan for one week to deliver a training to lawyers and law students on representing survivors of gender violence. 

During law school, William was a senior articles editor for the Hastings Race & Poverty Law Journal, president of the Government Law Organization, and political chair of the La Raza Law Students Association. 

William is a member of the American Bar Association, the Bar Association of San Francisco, and the Association of Latino Marin Attorneys.