Bill Gates
AGE: 51
OCCUPATION: Co-founder and Chairman of Microsoft, philanthropist
NUMBER OF TIME COVERS: 8
PREVIOUS APPEARANCES ON THE TIME 100: 4
PRO: Runs the world's largest software company and established the Bill & Melinda Gates Foundation, a charity worth $66 billion, which makes up over 10% of the assets of all charitable foundations in the U.S.
CON: The Gates Foundation has been accused of investing and reaping vast profit from companies that have been involved in unethical practices, worker discrimination, health-care fraud and slave labor.