From the Office of the District Attorney:
Martinez, California – Former San Ramon School District biology teacher and cheerleading coach Nicholas Brandon Moseby, 44, was sentenced to state prison on December 31st, 2025, after being convicted of sexually abusing and exploiting minors.
Moseby was sentenced by the Honorable Joni T. Hiramoto to three years and 8 months in state prison — the maximum term of incarceration allowed by law — and ordered to register for life as a sex offender.
After the court proceedings, Moseby was remanded into custody to immediately serve his prison sentence.
The investigation into and eventual arrest of Moseby occurred on September 14th, 2022. That’s when the Contra Costa County Internet Crimes Against Children Task Force served a search warrant at Moseby’s residence in Concord after receiving a report he had sent harmful material to a minor. The subsequent investigation determined Moseby had also unlawfully touched several different minors at schools he taught at, and during cheerleading training session in the San Ramon area.
After a five-week trial in September and October 2025, Moseby was found guilty of lewd acts with a child and sending harmful material to a minor, both felonies. Moseby was also convicted of two misdemeanors, sexual battery and annoying and molesting a minor.
Contra Costa District Attorney Diana Becton said: “This sentencing marks the end of a three-year legal process and delivers long-awaited justice for the brave victims who came forward. We hope this outcome brings them a measure of closure and affirms that their voices were heard.”
The case was prosecuted by Deputy District Jessica Murad with the Sexual Assault Unit for the District Attorney’s Office. The Contra Costa County Internet Crimes Against Children Task Force led the investigation with significant assistance from the Danville Police Department and Homeland Security Investigations. The Task Force includes detectives and investigators from the police departments of Walnut Creek, Concord, Pleasant Hill, Brentwood, Pittsburg, San Ramon, Danville, Oakley, and Moraga, as well as the Contra Costa County Sheriff’s Office, U.S. Secret Service, Homeland Security Investigations, and Inspectors from the Contra Costa County District Attorney’s Office.
