 Diaz then returned home and joined the litigation boutique firm Yarmuth Wilsdon Calfo, litigating the same types of cases.Diaz was an Assistant United States Attorney of the United States Attorney's Office for the Western District of Washington (“DOJ”) from 2008 to 2018, where he founded the office's Civil Rights Program in 2011.In that capacity, he investigated and/or prosecuted a wide variety of civil rights matters, from “classic” civil rights cases such as housing, employment and educational matters to more “modern” matters, such as disability rights, servicemember rights, and rights violated by police misconduct.