Jeffrey Nachmanoff (born March 9, 1967) is an American screenwriter and director. He wrote the screenplay for the 2004 blockbuster film The Day After Tomorrow. He wrote and directed Traitor, which was released on August 27, 2008. His commercially most successful films have been The Day After Tomorrow, which grossed US$544 million, and The Tourist, which grossed US$278 million. He is the director of Replicas (2018). Nachmanoff's family is Jewish.

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