Gene Sharp (1928-2018) was a professor emeritus of political science at the University of Massachusetts Dartmouth. He is known for his extensive writings on nonviolent struggle, which have influenced numerous anti-government resistance movements around the world. In 1983 he founded the Albert Einstein Institution, a non-profit organization devoted to studies and promotion of the use of nonviolent action in conflicts worldwide. Sharp's key theme is that power is not monolithic; that is, it does not derive from some intrinsic quality of those who are in power. For Sharp, political power, the power of any state—regardless of its particular structural organization—ultimately derives from the subjects of the state. His fundamental belief is that any power structure relies upon the subjects' obedience to the orders of the ruler or rulers. If subjects do not obey, leaders have no power. Sharp has been called both the "Machiavelli of nonviolence" and the "Clausewitz of nonviolent warfare." Sharp's scholarship has influenced resistance organizations around the world. More recently, the protest movement that toppled President Mubarak of Egypt drew extensively on his ideas, as well as the youth movement in Tunisia, and the earlier ones in the Eastern European colour revolutions that had previously been inspired by Sharp's work.