A lifelong advocate for public safety, Stefani has worked tirelessly to address gun violence, domestic violence, and corruption. As a former prosecutor with the Contra Costa County District Attorney's Office, she fought to protect vulnerable victims and authored Proposition D to establish local advocacy services for survivors of domestic violence and other crimes. Her commitment to reducing gun violence led her to found the San Francisco chapter of Moms Demand Action, where she took on the National Rifle Association and pushed for stronger gun safety laws.

In her time as a San Francisco County Supervisor, Stefani focused on improving community policing, enhancing first responder readiness, and supporting families. She championed affordable housing initiatives, fought for humane solutions to homelessness, and prioritized investments in education and public safety. Her collaborative leadership style and ability to deliver results earned her widespread recognition, including re-election in 2022 with strong community support.

Stefani grew up in Merced, California, where she developed a deep appreciation for the challenges facing working families. She earned her law degree from McGeorge School of Law and gained policy expertise working with leaders like San Jose Vice Mayor Cindy Chavez and former California Assembly Speaker Herb Wesson. Stefani now lives in San Francisco with her two children and her husband.