Nicholas is Gwen's adoptive father and Nick and Caroline's biological father. He was the late husband of Grace Shepherd nee Montrose. He agreed to take Gwen in and put her in the guise of his and Grace's daughter when Lucy and Paul ran away to the past with the stolen chronograph. Not much is known about him other than his caring nature and his death from cancer when Gwyneth was ten years old. It was also mentioned that Grace left Falk for Nicholas after their brief romance back when they were teenagers.