He's robbed at least three banks since May, police said.

Now, investigators are hoping you recognize him from surveillance video -- and are asking for your help in catching him.

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Suffolk County police said the first robbery took place at a Chase branch on Main Street in Holbrook on May 22, while the second took place at a Citibank on Montauk Highway in Bayport on June 6. The third robbery took place at a Capital One branch on Union Boulevard in West Islip on June 10.

In each of the robberies, police said the suspect entered, handed a demand note to the teller -- and fled with cash.

Police did not say how much money was stolen.

Police are asking anyone with information regarding the robberies to call Crime Stoppers at 800-220-TIPS. All calls will remain confidential.