[VladRussian2]

>I'm not even sure domain knowledge is important for a CEO of a company that size: once you become a $50 billion plus company, you don't have time to get involved with the details of the business.

Steve Jobs and CEOs in-between kind of make a counter-example.

[deletes]

Read the biographies of Steve and Steve; Jobs was not an expert, but was familiar with technology of that era. His father taught him electronics, and Jobs was working at Atari as an technician.