Bill Essayli holds a Juris Doctor from Chapman University and a bachelor's degree from California State Polytechnic University, Pomona. He began his career with an internship at the White House Counsel's Office and later transitioned to private practice, focusing on employment law. Essayli served as a prosecutor for the Riverside County District Attorney's Office and as an Assistant United States Attorney for the Central District of California, where he worked on high-profile cases, including the 2015 San Bernardino terrorist attack. He has held significant roles in both the public and private sectors, including a brief tenure as Acting United States Attorney for the Central District of California, which faced opposition and legal challenges.

Bill Essayli's political identity is marked by a complex blend of strict law enforcement and a nuanced stance on civil liberties, particularly in the context of protest and gun rights. His background as a prosecutor and interim United States Attorney reveals a highly calculated approach to criminal justice, as seen in his handling of the 2025 Los Angeles protests. However, Essayli's controversial tweet about approaching law enforcement with a gun highlights an unexpected tension between his enforcement-focused policies and potential infringements on civil rights. As the first Muslim elected to the California State Assembly, Essayli's personal narrative and religious identity also add a unique dimension to his political philosophy.