mogul - An important or powerful person, especially in the motion picture or media industry

With her universal name recognition, massive personal fortune, and successful television shows and movies, Oprah Winfrey is considered one of the biggest moguls on Earth.
reprehensible - Describing behavior, actions, or conduct that is morally wrong and worthy of disapproval or condemnation.

Though he told people not to repeat it, it was reprehensible for him to spread rumors about his colleague, knowing it would damage her reputation.