Are there any great leaders/minds in the world today? If there are, who?

I was thinking about people such as Martin Luther King, Gandhi, El-Hajj Malik El-Shabazz (Malcolm X), Langston Hughes, Einstein, Voltaire, Descartes and innumerable others. I just feel that there is a lack of strong leadership in the world today and I don't know what to attribute it to. I mean where are the people that help move the world towards good, fight injustices, and usher in new ways of thought.