A Roosevelt gunman who terrorized his victims during a half-hour robbery spree covering four businesses in January faces up to 25 years in prison after his jury conviction Wednesday, Nassau County prosecutors said.

A jury took three hours to find Timothy Lang, 32, guilty on all 18 charges, including first-degree robbery, four counts of second-degree robbery, three counts of first-degree attempted robbery, four counts of second-degree assault, three counts of third-degree criminal possession of a weapon, fourth-degree criminal possession of stolen property and two counts of fifth-degree criminal possession of stolen property.

Lang is scheduled to be sentenced by acting Supreme Court Justice Alan Honorof on Nov. 18.

Lang's court-appointed attorney, John J. Marshall Jr. of Rockville Centre, said Thursday he will work to provide information to the court that could mitigate his client's sentence.

After robbing three businesses, two in Roosevelt and another in Hempstead, at gunpoint on Jan. 4, starting at just after 6 p.m., Lang and his girlfriend were stopped by two employees as he tried to hold up a Uniondale smoke shop.

Lang struggled with the two before Nassau County police arrived to arrest him, shortly after 6:30 p.m., according to a news release by the Nassau County district attorney's office.

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In one of the robberies, Lang struck a gas-station employee with his gun, fracturing the victim's eye socket and dislodging several teeth, authorities said.

In the attempted robbery of the smoke shop, Lang used his gun to strike one of the employees in the forehead, according to the release.

At three of the businesses, Lang was recorded on video surveillance; his clothing also had blood DNA from the two victims he assaulted, prosecutors said.

Proceeds from the robberies were found in his car, where his girlfriend, Kaphia Larode, of Roosevelt, remained while Lang went into the businesses, authorities said.

Earlier, Larode pleaded guilty to attempted robbery and was sentenced to 6 months in jail and 5 years' probation.

Acting District Attorney Madeline Singas praised the actions of the two smoke shop employees who "tackled" Lang, holding him for police.

CORRECTION: Timothy Lang's hometown was incorrect in the initial version of this story.