I liked his “Tool of the Trade” a lot. Soviet sleeper in the US working as a psychology professor for twenty years inadvertently discovers an audible tone that will put most people into a hypnotic state and do whatever he tells them.
Another author hot in about the same period was John Varley, whose first book, The Persistence of Vision should have made this list and did not. The Star Trek film with the whales stole one of the core ideas in The Ophiuchi Hotline from him, again without attribution. So it goes.