George B. Thomas, Jr. (late) of the Massachusetts Institute of Technology (MIT), was a professor of mathematics for 38 years; he served as the executive officer of the department for 10 years and as graduate registration officer for 5 years. Thomas held a spot on the board of governors of the Mathematical Association of America and on the executive committee of the mathematics division of the American Society for Engineering Education. His textbook, Calculus and Analytic Geometry, was first published in 1951 and has since gone through multiple revisions. The textbook is now in its 12th edition and continues to guide college students through their calculus courses. He also co-authored monographs on mathematics, including the textbook Probability and Statistics.