Apple co-founder Steve Jobs is another person on our list who is no longer living, but his widow Laurene Powell Jobs, whom he married in 1991, is quite a force in her own right. On top of being the heiress to the Jobs fortune, she is the executive and founder of Emerson Collective and president of the board of College Track, which helps prepare disadvantaged high school students for college. She has a net worth of $19 billion.