One of the foremost mathematicians of our time and the father of quants
James Simons – Mathematics, Common Sense, and Good Luck: My Life and Careers
Simons has about 9,000 views on YouTube
The other is by Ray Dalio, who runs Bridgeport Associates (reportedly the world’s largest hedge fund) Dalio has a lot more views about 350,000.
How the Economic Machine Works
Then again you could watch What Does the Fox Say with a 149 million views