North Hempstead Public Safety Commissioner Andrew DeMartin resigned Monday to run for a seat on the state Assembly.

DeMartin, 50, a Democrat from Great Neck, said he was leaving his $118,000-a-year post because “of course my focus has got to be on winning the 16th Assembly District.”

DeMartin, who has worked for the town since 2011, formed a campaign committee last month after Assemb. Michelle Schimel (D-Port Washington) said she would not seek re-election this fall.

Town Supervisor Judi Bosworth, in an email to staff Monday, said she “would like to thank Andy for his many contributions to the Town. Please join me in wishing him the best of luck in his future endeavors.”

Bosworth said Deputy Public Safety Commissioner Shawn Brown will serve as the department’s acting commissioner. Brown will oversee security, code enforcement, harbor patrol, and the town’s animal shelter in Port Washington. He’ll also run the Port Washington Parking District, which controls much of the town’s commuter parking.

DeMartin did not elaborate on his plans. “It’s not clear at what point I need to take another job,” he said. “I’ve had offers in the past. Right now, I really just want to work on becoming the assemblyman for my district.”

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DeMartin, who has worked for the town since 2011, said he did not want to take focus away from his responsibilities, which include oversight of seven departments, and that he worried a campaign would lead to him “basically shirking those responsibilities to move forward at the Assembly.”

DeMartin is a former commissioner of the Manhasset-Lakeville Water District, an elected position, and former chief of the Great Neck Vigilant Fire Company.

The town’s Democratic committee is looking for a successor to Gerard Terry, who resigned last week as party chairman after Newsday reported he had collected $1.4 million in federal and state tax debts while receiving hundreds of thousands of dollars in public work. District Attorney Madeline Singas’ office is investigating his contracts and billings.