Andrew Ng is probably one of the scientist and entrepreneurs in Silicon Valley I admire most; apart from being a Machine Learning genius, he also fully embraces the values of freely sharing knowledge, and he has actually done something about it (Coursera) that has become wildly successful.

This is a very good article, which I recommend:
http://www.huffingtonpost.com/2015/05/13/andrew-ng_n_7267682.html