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Warren Kendall Lewis (21 August 1882-9 March 1975) was an MITmarker professor who has been called the father of modern chemical engineering. He co-authored an early major textbook on the subject which essentially introduced the concept of unit operations. He also co-developed the Houdry process under contract to The Standard Oil Company of New Jersey (now ExxonMobil) into modern fluid catalytic cracking with Edwin R. Gilliland, another MIT professor.


Lewis was born in Laurel, Delawaremarker on 21 August 1882 and went to MIT to study engineering. He took the chemical engineering option from the Department of Chemistry, which so engaged him that he went for postgraduate study of physical chemistry in Breslaumarker, Germanymarker, receiving the degree of DSc in 1908. Shortly after, he published a paper on "The Theory of Fractional Distillation" which was the basis for subsequent chemical engineering calculation methods. (He later authored 19 patents on distillation.) After some industrial experience as a chemist, he returned to MIT and in 1920 he became the first head of the newly-formed Department of Chemical Engineering at MIT a position he held for 13 years before returning to teaching and research. He was made professor emeritus in 1948 and continued to work within the department until his death on 9 March 1975.


He received numerous awards both for his research and contributions to education, including the Perkin Medal of the Society of Chemical Industry (1936), the Lamme Medal of the American Society of Engineering Education (1947) and the Priestley Medal of the American Chemical Society (1947). He was the first chemical engineer to achieve the Priestley Medal.He is commemorated in the Warren K. Lewis Award for Chemical Engineering Education of the AIChE and in the Warren K. Lewis Lectureship at MIT.


  1. Biographical Memoirs, National Academy of Science
  2. W. H. Walker, W. K. Lewis & W. H. McAdams (1923) Principles of Chemical Engineering New York, McGraw-Hill
  3. W. K. Lewis (1909) Journal of Industrial and Engineering Chemistry, vol 1 (8) pp 522-533
  4. Chemical & Engineering News 86 (14) April 7, 2008 (special edition on Priestly Medal) 1947: Warren K. Lewis (1882–1975)
  5. Warren K. Lewis Award
  6. Lewis lecture

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