Those interested in the history of Yahoo's rather complex corporate governance issues should check out this HBS case (I assume this link has distribution rights; I'm not supposed to distribute my copy):

http://www.thedecisiongroup.nl/wp-content/uploads/2013/03/Ca...

That's a quick overview with some more quantitative data on how the whole thing went down. It shows you what one man can do with 5% of a company.