Job-hopping is common among PR pros, but John Graham, chairman and CEO of Fleishman-Hillard, has thrived at the same firm for 38 years by being calm, courteous, and mindful of culture.

John Graham's clients are not surprised he has eschewed this magazine profile for so long. "One thing about John that has been consistent from day one is that he never wanted credit for anything good that happened," says Charles Knight, chairman of Emerson. In fact, the chairman and CEO of ...