NEW YORK (CBSNewYork) — Authorities are trying to track down a group of teens wanted for beating up a City University of New York college professor inside a Staten Island park last week.

Authorities say the CUNY St. George professor was walking to a university event last Wednesday afternoon when he saw the teens setting paper on fire in a playground at Nicholas Lia Memorial Park in St. George.

The teens punched and kicked the professor when he told them to stop, police said.

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Authorities are trying to track down a group of teens wanted for beating up a CUNY professor inside a Staten Island park last week. (credit: NYPD)

He was treated at Richmond University Medical Center for bruising and swelling.

Police said they’re looking for seven teens in connection with the incident. They’ve released a sketch of one of the suspects.

Anyone with information is asked to call the NYPD’s Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).

The public can also submit their tips by logging onto the Crime Stoppers website or by texting their tips to 274637 (CRIMES) then enter TIP577.