Who is Jack Kalantzakos from Native Speaker and what is their importance? Native_Speaker English & Literature Jack Kalantzakos | Native Speaker

Jack is one of Henry's coworkers at Glimmer & Company, and he has been there longer than anyone except the company founder. Jack is approaching retirement when the novel opens. Unlike the other employees who merely have experience befriending subjects in order to gain information, Jack has a past that involves violent forms of espionage. As a young man in Athens, he was involved in arson, kidnapping, and murder.