Jack has maintained a passion for preserving and sharing history in each of his careers. He started as a high school history teacher in Newark Valley, New York. He would move on to being an archivist and historical librarian that would take him from Cornell University to New York City. The bulk of his career was at the Metropolitan Museum of Art. During his twenty-seven years at the Met, Jack primarily held the role of Chief Registrar, where he oversaw worldwide art movements. Concurrently with his job as Chief Registrar, he was Special Assistant to the Director and later Special Assistant to the President. Jack’s retirement from the museum has led to a writing career. Currently he has authored three books on early American history, two on the Revolutionary War and one on Andrew Jackson. All of the books are required readings at select universities. One book, The Road to Valley Forge, won the Thomas Fleming Award for Best Book of 2004 from the American Revolution Round Table of Philadelphia. Jack has also published short stories, and in 2010 his first novel, The Rise of Stefan Gregorovic.