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Isocrates was an influential teacher, perhaps the most so in the ancient history of rhetoric. His students included many notable citizen statesmen and decorated leaders. Isocrates' school had entrance requirements (few others did in those days--other than the requisite tuition).
Hippocrates did exist (although some scholars dispute even this) and was well known in the Greek world. Apparently born about 460 B.C. on the island of Cos, he died about 370 in Thessaly. He was a teacher on Cos, an itinerant practitioner of medicine, and the presumed author of a number of treatises.