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Jim Vos, the CEO of hedge fund advisory firm Aksia — which helped invest pensions for New York police officers, firefighters and teachers — was arrested after his kids threw a boozy underage party at his Connecticut mansion.

Hedge fund consultant Vos turned himself in to police in late June after one young girl was taken to Norwalk Hospital with a suspected head injury. Then cops found vomit over the grounds of Vos’ 7,000-square-foot home, all while he was at home.

The girl was immediately released from the hospital without injury.

According to a report on NewCanaanite.com, the May 30 party involved 24 young people, plus beer pong, to celebrate their graduation from posh private school St. George’s in Newport, RI, where tuition runs to $60,000 a year.

After the teen was taken to the hospital, police went to Vos’ home at 2 a.m. Officer Clinton Jarvis said of the backyard, “I found the remains of an alcohol party, which included the strong odor of alcohol. I observed multiple areas on the patio and lawn covered in vomit.”

Jarvis said he found empty Budweiser cans and Mike’s Hard Lemonade bottles. Vos, he said, “knowingly had minors on his property consuming alcohol and failed to intervene, which ultimately resulted in the injury of an intoxicated juvenile.” Inside, they found “an intoxicated male laying on the couch.”

Vos “remained uncooperative,” telling officers, “I’m not going to answer any questions.”

Vos’ son, 22, and daughter, 18 — who say their dad was asleep and was not aware they were secretly drinking — were also charged. The family of the hospitalized girl is not seeking compensation from the Vos family.

Aksia has more than $62 billion under advisory, including the Pennsylvania Public Schools Employees’ Retirement System.

Aksia had advised the New York State Common Retirement Fund (NYSCRF), the state’s largest public pension fund, on hedge fund investments, but lost the contract in 2011 after charging $1.7 million in fees in a year, while a rival firm quoted $400,000.

Vos didn’t get back to us.