Owns the company Microsoft, which makes and owns the rights to Windows, Explorer, Microsoft Office (Word, Excel, Outlook, FrontPage, Powerpoint etc. etc.). Therefore, incredibly profitable company in Seattle, as almost every business on the planet pays it a commission for using its software (excluding those in South East Asia, for example, where the copyright and patent treaties do not apply).
For general lust for power, in US historical terms, ranks far below the other earlier Robber Barons, like say J.P. Morgan, Rockefeller etc etc.
Bill Gates, the nerdy Robber Baron with a human face.