John Philip Grime FRS is a prominent British ecologist and emeritus professor at the University of Sheffield. He is best known for his CSR theory on plant strategies, for the unimodal relationship between species richness and site productivity (the "humped-back model"), for the Intermediate Disturbance Hypothesis, for the DST classification (dominants, subordinates and transients) and, with Simon Pierce (University of Milan, Italy), universal adaptive strategy theory (UAST) and the twin filter model of community assembly and eco-evolutionary dynamics.