John Tyler Bonner (May 12, 1920 – February 7, 2019) was an American biologist who was a professor in the Department of Ecology and Evolutionary Biology at Princeton University. He was a pioneer in the use of cellular slime molds to understand evolution and development over a career of 40 years and was one of the world's leading experts on cellular slime moulds. Arizona State University says that the establishment and growth of developmental-evolutionary biology owes a great debt to the work of Bonner's studies. His work is highly readable and unusually clearly written and his contributions have made many complicated ideas of biology accessible to a wide audience. Career Bonner was the George M. Moffett Professor Emeritus of Biology at Princeton University. He was trained at Harvard University between 1937 and 1947, aside from a stint in the United States Army Air Forces from 1942 to 1946. He soon joined the faculty of Princeton University, becoming the chairman of the Princeton Biology Department between 1966 and 1977, also in 1983-84 and 1987–88. He held four honorary doctorates and was a fellow of the American Association for the Advancement of Science. He was elected to the American Academy of Arts and Sciences in 1969 and the American Philosophical Society in 1972. He was made a National Academy of Sciences fellow in 1973. He was a visiting scholar at the Indian Institute of Science in 1993 and the Indian Academy of Sciences in 1990. He has also been visiting faculty at Brooklyn College, Williams College and University College, London. He also was a Sheldon Travelling Fellow in 1941 in Panama and Cuba while in graduate school, a Rockefeller Traveling Fellow 1953 in Paris, France, and held Guggenheim Fellowships in 1958 and from 1971 to 1972 in Edinburgh, Scotland. He held a National Science Foundation Senior Postdoctoral Fellowship in Cambridge, England in 1963. He also had Commonwealth Foundation Book Fund Fellowships in 1971 and between 1984 and in 1985 Edinburgh, Scotland and a Josiah Macy, Jr. Foundation Book Fund Fellowship in 1978 in Edinburgh, Scotland. He died in February 2019 at the age of 98. Works He wrote several books on developmental biology and evolution, many scientific papers, and produced a number of works in biology. He is best known as one of the world's leading experts on slime moulds and he led the way in making Dictyostelium discoideum a model organism