Peter Sandman’s career defies easy definition. For many years he was a leading environmental activist, and used his communications expertise to teach college students and public-interest groups how to deliver their messages. When I was one of his students at Rutgers in the late seventies, he taught me to care about the environment and to write precisely. Decades later, when I looked up my former mentor, I was surprised to find that he is now this country’s preeminent “risk communications” consultant, and that his clients include some of the same big corporations that his other students had hoped to take down, or at least humble a little.