Student, University Connecticut, 1950-1951; Bachelor of Arts summa cum laude (James Manning scholar), Brown U., 1954; postgraduate (G.H. Palmer scholar, Woodrow Wilson fellow), Harvard University, 1956.
Writer radio news, WSTC, Stamford, Connecticut, 1957-1959;
editor, Doubleday & Company, Inc., New York City, 1959-1964;
editor, Harper & Row, New York City, 1964-1967;
education editor, New American Library, New York City, 1967-1969;
director trade department, St. Martin's Press, New York City, 1969-1970;
president, St. Martin's Press, 1970-1987;
chief Executive officer, editorial director, St. Martin's Press, 1970-1996;
chairman, St. Martin's Press, 1987-1997. President, Chairman of the Board St. James Press, Ltd., London, 1973-1979. Vice president, treas.Sandra D. McCormack, Inc.
(Interior Designer.). Chairman, chief Executive officer Tor Books, New York City, 1987-1996. Executive Committee Holtzbrinck GmbH, Stuttgart, Germany, 1995-1997.
( "Lucid, thoughtful writers and teachers will learn much...)
(Book by Thomas McCormack, McCormack, Tom)
Member Play Development Council, Manhattan Theater Club, 1995-2001, Dramatists Gild, since 1997. With Army of the United States, 1954-1956. Member Association American Publications (director 1973-1976, freedom to read committee 1974-1977, Curtis Benjamin award 1997, LMP Lifetime Achievement award 1997), Phi Beta Kappa.
Clubs: The Players (New York City), Century Association (New York City).
Married Sandra Harriet Danenberg, August 21, 1964. Children: Daniel Aaron, Jed Charles (deceased), Jessie Annual.