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Kline grew up in Brooklyn and in Jamaica, Queens. After graduating from Boys High School in Brooklyn, he studied mathematics at New York University, earning a bachelor's degree in 1930, a master's degree in 1932, and a doctorate in 1936. He continued at NYU as an instructor until 1942.
During World War II, Kline was posted to the Signal Corps (United States Army) stationed at Belmar, New Jersey. Designated a physicist, he worked in the engineering lab where RADAR was developed. After the war he continued investigating electromagnetism, and from 1946 to 1966 was director of the division for electromagnetic research at the Courant Institute of Mathematical Sciences.
Kline resumed his mathematical teaching at NYU, becoming a full professor in 1952. He taught at New York University until 1975, and wrote many papers and more than a dozen books on various aspects of mathematics and particularly mathematics teaching. He repeatedly stressed the need to teach the applications and usefulness of mathematics rather than expecting students to enjoy it for its own sake. Similarly, he urged that mathematical research concentrate on solving problems posed in other fields rather than building structures of interest only to other mathematicians. One can get a sense of Kline's views on teaching from the following:
I would urge every teacher to become an actor. His classroom technique must be enlivened by every device used in theatre. He can be and should be dramatic where appropriate. He must not only have facts but fire. He can utilize even eccentricities of behavior to stir up human interest. He should not be afraid of humor and should use it freely. Even an irrelevant joke or story perks up the class enormously.
Mathematics education 
Morris Kline was a protagonist in the curriculum reform in mathematics education that occurred in the second half of the twentieth century, a period including the programs of the new math. An article in 1956 in The Mathematics Teacher, the main journal of the National Council of Teachers of Mathematics, by Kline was titled "Mathematical texts and teachers: a tirade". Calling out teachers blaming students for failures, he wrote "There is a student problem, but there are also three other factors which are responsible for the present state of mathematical learning, namely, the curricula, the texts, and the teachers." The tirade touched a nerve, and changes started to happen. But then Kline switched to being a critic of some of the changes. In 1958 he wrote "Ancients versus moderns: a new battle of the books". The article was accompanied with a rebuttal by Albert E. Meder Jr. of Rutgers University. (Mathematics Teacher 51:428 –33). He says, "I find objectionable: first, vague generalizations, entirely undocumented, concerning views held by ‘modernists’, and second, the inferences drawn from what has not been said by the ‘modernists’." By 1966 Kline yielded to the pressure to propose something positive with his eight-page high school plan (Mathematics Teacher 59:322–330). The rebuttal for this article was by James H. Zant and asserted that Kline had "a general lack of knowledge of what was going on in schools with reference to textbooks, teaching, and curriculum." He criticized Kline’s writing for "vagueness, distortion of facts, undocumented statements and overgeneralization."
Kline continued his critique of mathematical education with his 1966 article "Intellectuals and the schools: a case history" in Harvard Educational Review (36:505–11). In 1970 he followed with "Logic versus pedagogy" in American Mathematical Monthly (77:264–82). In 1973 St. Martin’s Press contributed to the dialogue by publishing Kline’s critique, Why Johnny Can’t Add: the Failure of the New Math. Its opening chapter is a parody of instruction as students’ intuitions are challenged by the new jargon. The book recapitulates the debates from Mathematics Teacher, with Kline conceding some progress: He cites Howard Fehr of Columbia University who sought to unify the subject through its general concepts, sets, operations, mappings, relations, and structure.
In 1977 Kline turned to undergraduate university education; he took on the academic mathematics establishment with his Why the Professor Can’t Teach: the dilemma of university education. Kline argues that requiring original mathematics from professors distracts them too much from the broad knowledge necessary to teach. He lauds scholarship as expressed by expository writing or reviews of original work of others. For scholarship he expects critical attitudes to topics, materials and methods. Among the rebuttals are those of May 1979 in American Mathematical Monthly (86:401–12.) by D.T. Finkbeiner, Harry Pollard, and Peter Hilton, in which Pollard writes, "The society in which learning is admired and pursued for its own sake has disappeared." The Hilton review was more direct: Kline has "placed in the hand of enemies…[a] weapon". Though Kline began, in 1956, with a call to action, once the mobilization was in motion he turned critic. Skilled expositor that he was, editors frequently felt his expressions were best tempered with rebuttal.
In considering what motivated Morris Kline to agitate so much we can look back to Professor Meder’s opinion in Mathematics Teacher 51:433:
- I am wondering whether in point of fact, Professor Kline really likes mathematics”. [...] I think that he is at heart a physicist, or perhaps a ‘natural philosopher’, not a mathematician, and that the reason he does not like the proposals for orienting the secondary school college preparatory mathematics curriculum to the diverse needs of the twentieth century by making use of some concepts developed in mathematics in the last hundred years or so is not that this is bad mathematics, but that it minimizes the importance of physics.
It might appear so, as Kline recalls E. H. Moore’s recommendation to combine science and mathematics at the high school level in his Why Johnny Can’t Add (p. 147). But closer reading shows Kline calling mathematics a "part of man’s efforts to understand and master his world", and he sees that role in a broad spectrum of sciences.
- Introduction to Mathematics (with Irvin W. Kay), Houghton Mifflin, 1937
- The Theory of Electromagnetic Waves (ed), Inter-science Publishers, 1951
- Mathematics in Western Culture, Oxford University Press,1953
- Mathematics and the Physical World, T. Y. Crowell Co., 1959
- Mathematics, A Cultural Approach, Addison-Wesley, 1962
- Electromagnetic Theory and Geometrical Optics (with Irvin W. Kay), John Wiley and Sons, 1965
- Calculus, An intuitive and Physical Approach, John Wiley and Sons, 1967, 1977, Dover Publications 1998 reprint ISBN 0-486-40453-6
- Mathematics for Liberal Arts, Addison-Wesley, 1967, (republished as Mathematics for the Nonmathematician, Dover Publications, Inc., 1985) (ISBN 0-486-24823-2)
- Mathematics in the Modern World (ed), W. H. Freeman and Co., 1968
- Mathematical Thought From Ancient to Modern Times, Oxford University Press, 1972
- Why Johnny Can't Add: The Failure of the New Mathematics, St. Martin's Press, 1973
- Why the professor can't teach: Mathematics and the dilemma of university education, St. Martin's Press, 1977 (ISBN 0-312-87867-2)
- Mathematics: The Loss of Certainty, Oxford University Press, 1980 (ISBN 0-19-502754-X); OUP Galaxy Books pb. reprint (ISBN 0-19-503085-0)
- Mathematics: An Introduction to Its Spirit and Use; readings from Scientific American
- Mathematics in the Modern World; readings from Scientific American
- The Language of Shapes (with Abraham Wolf Crown)
- Mathematics and the Search for Knowledge
- Pace, Eric (June 11, 1992). "Morris Kline, 84, Math Professor And Critic of Math Teaching, Dies". New York Times. Retrieved 2 December 2010.
- G. L. Alexanderson (2008). "Morris Kline". In Donald J. Albers and Gerald L. Alexanderson. Mathematical People: Profiles and Interviews (2nd. ed.). A K Peters, Ltd. pp. 173–183. ISBN 978-1-56881-340-0.0
- O'Connor, John J.; Edmund F. Robertson. "Morris Kline". MacTutor History of Mathematics Archive. Retrieved 17 January 2011.
- Mathematics Teacher 49:171.
- A website having links to two of his books Why Johnny Can't Add? and Why The Professor Can't Teach, a lecture titled Pea Soup, Tripe and Mathematics, and an obituary.