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Thomas James Fleming was an historian and historical novelist, with a special interest in the American Revolution. He was born in 1927 in Jersey City, New Jersey, the son of a World War I hero who was a leader in Jersey City politics for three decades. Before her marriage, his mother, Katherine Dolan Fleming, was a teacher in the Jersey City Public School System.

After graduating from St. Peter's Preparatory School in Jersey City, Fleming spent a year in the United States Navy. He received a Bachelor's degree, with honors, from Fordham University in 1950. After brief stints as a newspaperman and magazine editor, he became a full-time writer in 1960. His first history book, Now We Are Enemies, an account of the Battle of Bunker Hill, was published that same year. It was a best-seller, reviewed in more than 75 newspapers and featured as a main selection of the Literary Guild.

Fleming published books about various events and figures of the Revolutionary era. He also wrote about other periods of American history and wrote over a dozen well-received novels set against various historical backgrounds. He said, "I never wanted to be an Irish American writer, my whole idea was to get across that bridge and be an American writer".

Fleming died at his home in New York City on July 23, 2017, at the age of 90.