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

Jack Kalantzakos works with Henry at Glimmer & Company. Jack, is fact, has been with the company longer than anyone except the company's founder. Although, Jack is approaching retirement, we learn that he has done more for the company than simply gather information. Jack has been involved in espionage, arson, kidnapping, and murder. Over the course of the novel, Jack serves as Henry's mentor. He gives him advice about the job, as well as advice and encouragement for repairing his marriage.