Prior to viewing the video below, I suggest you read these three posts (in this order):
• The kinda-eventually-sorta-mostly-almost Efficient Market Theory (November 20th, 2004)
• Random Walk and Outperforming Fund Managers (July 19th, 2006)
• How Shiller helped Fama win the Nobel (October 26th, 2013)
In 2008, Eugene Fama made a video for the American Finance Association on the history of the efficient markets hypothesis.
Hat tip The Grumpy Economist