A 60-year-old convicted sex offender, Mark Sullivan, has been arrested in connection with allegations of filming children at Boston Common’s Frog Pond. The incident reportedly took place on 14 August 2023, prompting a swift police response after witnesses raised the alarm.
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According to Boston Police, officers were alerted to the situation around 1 p.m. when a witness observed Sullivan engaged in a dispute with another individual. As officers began their investigation, additional witnesses reported seeing Sullivan using camera-equipped sunglasses to record children in the area. These accounts suggested that he was specifically targeting a family who were attempting to change their children’s clothing, despite the children being covered with towels for privacy.
Witness accounts indicated that the family attempted to relocate to avoid Sullivan’s behaviour but were reportedly followed by him, who continued to document their activities. When confronted by onlookers, Sullivan allegedly tried to destroy the sunglasses he was using at the time, claiming that a group of individuals had assaulted him in an attempt to seize them.

By the time police arrived on the scene, the family had already left, but authorities quickly discovered that Sullivan is a registered sex offender, with significant prior convictions related to child sex offences. Officers seized Sullivan’s sunglasses and mobile phone during the process.
Sullivan’s arrest took place on 18 August 2023 at his residence in Brockton, Massachusetts, with involvement from both Boston police officers and the U.S. Marshals. His previous record, which features ten convictions for child-related sex offences, placed him on the level three sex offender registry, indicating a higher risk to public safety.
Following his arrest, Sullivan was arraigned in Boston Municipal Court, where he pleaded not guilty to charges of photographing the sexual or intimate parts of a child. His attorney, Denise Moore, indicated during the hearing that Sullivan has not been employed since 2007 and requested that bail be set at $1,000. Moore further commented on the situation, noting that the individual who contacted the police did not witness any inappropriate behaviour directly.
The prosecution argued for a bail amount of $100,000, but the judge ultimately set bail at a higher £250,000, outlining specific conditions if Sullivan were to post bail. These conditions include prohibitions against approaching children, wearing a GPS tracking device, maintaining distance from the City of Boston, and refraining from internet use.
The judge also mentioned that the bail could potentially be lowered if authorities do not find any illicit material on Sullivan’s electronic devices. His next court appearance is scheduled for 15 September 2023, as legal proceedings continue in this troubling case.
Local law enforcement maintained their commitment to addressing issues of child safety and protection, while discussions regarding the ramifications of Sullivan’s alleged actions are expected to continue in the community.
Anyone who may be affected by similar circumstances is encouraged to reach out for support. The Crisis Text Line offers confidential help through text, connecting individuals with certified crisis counsellors.
