A Contra Costa County jury has determined that a former Danville middle school teacher's sex crimes against minors were made worse by his exploitation of trust and the vulnerability of his victims—findings that could significantly extend his prison sentence when he faces the judge in December.
The jury's decision came Tuesday, October 29, in the second phase of Nicholas Brandon Moseby's bifurcated trial. The 44-year-old Concord resident had been convicted less than two weeks earlier on one felony count of lewd acts upon a child, one felony count of distributing pornography to a minor, and three misdemeanor counts of child molestation and sexual battery.
What the Jury Found
During this week's proceedings, jurors found three aggravating circumstances to be true: the victim was particularly vulnerable, according to the Contra Costa District Attorney's Office. The crimes demonstrated planning and sophistication, and critically, Moseby exploited his position of trust as both a biology teacher and cheerleading coach to commit the offenses. The jury couldn't reach agreement on whether Moseby's prior criminal history showed a pattern of increasing seriousness, resulting in Judge John W. Kennedy declaring a mistrial on that specific factor.
These findings matter because under California's sentencing laws, they authorize Judge Kennedy to impose a longer prison term when Moseby appears for sentencing on December 19 at the A.F. Bray Courthouse in Martinez. The aggravating factors must be found true beyond a reasonable doubt—either through jury verdict or defendant stipulation—before a judge can exceed the standard middle-term sentence, according to California Rules of Court.
A Case Three Years in the Making
The criminal case began in September 2022 when a minor victim reported incidents to authorities. The charges stem from Moseby sending pornographic videos of himself via Snapchat to a then-15-year-old student, as reported by the East Bay Times. Following investigation by the Contra Costa County Internet Crimes Against Children Task Force, additional victims came forward with allegations spanning back to January 2022.
At the time of his arrest on September 14, 2022, Moseby was employed as a biology teacher at Diablo Vista Middle School in Danville and worked as a cheerleading instructor at Nor Cal Elites in San Ramon. According to the Pleasanton Weekly, he had worked as a tumbling coach for NorCal Elite since 2013 and began teaching at Diablo Vista in 2021, after a brief stint at San Ramon Valley High School.
The Trial Revealed Troubling Patterns
The six-week trial, which finally got underway in late August 2025 after eight postponements, painted a disturbing picture of grooming behavior. Deputy District Attorney Jessica Murad argued that Moseby would flirt with girls, communicate with them on social media, talk about their bodies, and then began groping one victim "under the guise of spotting for a back handspring," the East Bay Times reported. Prosecutors presented evidence that Moseby's touching of girls' buttocks coincided with his pornography searches online, which showed interest in terms like "bubble booty," "high school," and references to teens.
Some witnesses required therapy animals while testifying. Three additional alleged victims who were not part of the criminal charges also testified to support the prosecution's case, according to KRON4.
A Problematic Hiring History
Perhaps most troubling is the revelation that both the San Ramon Valley Unified School District and NorCal Elite hired Moseby despite his prior criminal history. The East Bay Times reported that Oakland police arrested Moseby in 2015 when he allegedly showed up to a hotel after agreeing to pay an undercover officer posing as a prostitute $120 for sex. He received a deferred judgment in that case.
In 2009, he was convicted of a misdemeanor for providing alcohol to a teen in Arizona—a case that police had initially investigated as a sexual abuse allegation. In 2010, Moseby was charged with being drunk in public in Santa Barbara but failed to appear at his arraignment, according to court records. A judge issued a warrant for his arrest that remained active when he was arrested in 2022. Additionally, in 2009, an Arizona judge issued a warrant for failing to submit to fingerprint testing.
District officials claimed these arrests didn't show up on background checks and he wasn't flagged by the California Commission on Teacher Credentialing. Moseby did inform the district about his 2009 Arizona case, saying the charges were dismissed.
Warning Signs Were Allegedly Ignored
According to a civil lawsuit filed by four alleged victims, students at San Ramon Valley High School complained about Moseby repeatedly during the 2021-2022 school year. The lawsuit alleges that two girls filed written complaints in October 2021 claiming Moseby touched one of them sexually and made comments like "you're lucky you're hot," according to Danville San Ramon.
Rather than removing him from the classroom, the district transferred Moseby from San Ramon Valley High School to Diablo Vista Middle School in 2022—where he would encounter his youngest alleged victim. According to the East Bay Times, several of Moseby's alleged victims have filed a lawsuit against the school district, alleging officials failed to heed warning signs, leading to more sexual abuse. That lawsuit remains unresolved.
In a striking detail that illustrates the disconnect, before his transfer, a group of freshman boys taped a poster to Moseby's classroom door with the claim that he was a "pedophile." At the time, the school deemed the incident part of a targeted harassment campaign against Moseby, according to the East Bay Times.
Part of a Broader Pattern
Moseby's case is unfortunately not an isolated incident in Contra Costa County schools. The county has seen multiple cases of educators accused of crimes against children in recent years. In June 2025, a teacher's aide from Discovery Bay was arrested on charges of possessing child sexual abuse materials, according to the Department of Justice. That same year, six men were arrested in "Operation Broken Heart," including a teacher from Hayward who allegedly sent explicit images taken in his classroom to undercover officers posing as 13-year-old girls, as reported by Contra Costa News.
School districts across California are also facing a wave of sexual abuse lawsuits following Assembly Bill 218, which opened a three-year window starting in 2019 for survivors of childhood abuse to sue public agencies for cases that had expired more than a decade earlier. A recent appellate court ruling in a case involving Acalanes Union High School District in Orinda rejected the district's argument that this law violated the state Constitution, according to the Mercury News.
The Legal Process and What's Next
California's sentencing structure underwent significant changes following Senate Bill 567, which now requires that aggravating circumstances be proven beyond a reasonable doubt before a judge can impose more than the standard middle term. In Moseby's case, the bifurcated trial—where guilt and aggravating factors are determined in separate phases—reflects these modern procedural requirements designed to protect defendants' rights while still allowing enhanced sentences when warranted.
The jury's split verdict shows the complexity of the case. While jurors convicted Moseby on multiple counts, they were unable to reach a verdict on one felony count of committing a lewd act upon a child, and found him not guilty on a separate charge of the same offense. Judge Kennedy declared a mistrial on the undecided count.
"The victims have traveled a long road to justice," District Attorney Diana Becton said in a statement. "This jury's verdict opens a path toward healing from the trauma—not only for the victims, but for the broader community as well."
Moseby has remained out of custody on bail throughout the proceedings. Judge Joni Hiramoto, who presided over the trial, allowed him to remain free while awaiting sentencing.
The December 19 sentencing hearing will determine how much additional time Moseby will serve beyond the minimum required by his convictions. The aggravating factors found true by the jury give Judge Kennedy the authority to impose a significantly longer sentence than would otherwise be possible, potentially adding years to Moseby's incarceration.
Why This Article Now
While Moseby's initial conviction came on October 17, 2025, the aggravating factors phase concluded only this week, making this the appropriate time to provide comprehensive context about the case's resolution and its broader implications for school safety and accountability in the East Bay.
