Yes ......my dear friends E=mc² was not only the work of great scientist Albert Einstein but some more physicist were involved for the discovery of this formula.......
A news paper article says.........
Two American physicists outline the role played by Austrian physicist Friedrich Hasenöhrl in establishing the proportionality between the energy (E) of a quantity of matter with its mass (m) in a cavity filled with radiation. In a paper about to be published in the European Physical Journal H, Stephen Boughn from Haverford College in Pensylvannia and Tony Rothman from Princeton University in New Jersey argue how Hasenöhrl's work, for which he now receives little credit, may have contributed to the famous equation E=mc².............
For complete news you can follow the website.........http://www.sciencedaily.com/releases/2013/01/130125103931.htm

Thank you ............ ;) :)