A 25 year-old Princeton Review teacher from NJ was arrested yesterday after one of his previous victims remembered him: Daniel Genis robbed 18 people in Lower East Side, Greenwich Village, Chelsea, Gramercy Park and the Financial District from mid-July to mid-August. The 18 robberies totaled $700, and Genis tended to target women, though the Post says he stalked an 81 year-old man in the East Village, threatening them at knifepoint in their apartment vestibules and lobbies. Police say, "While he was robbing the victims, he would say things like, 'I'm sorry to do this to you,' or 'Please forgive me. I need the money. I'm sorry.'" The NYU math graduate was arrested in Chinatown; he had prior drug arrests, leading police to believe that the robberies were likely for drug money.