A new book called Lasting Leadership: Lessons from the 25 Most Influential Business People of Our Times includes Sir Richard Branson in the top-25 list, but seems to profile him based on articles and previous speeches instead of a new interview.

Also, an article about entrepreneurs has this to say about the "Portfolio or Strategic Entrepreneur" archetype:

Description: Starts a string of ventures, which often fit an overall business vision.
Profile: Empire-builder. Constantly searching for new opportunities to build a brand, often by encouraging a personality cult.
Fits: Sir Richard Branson, Stelios Haji-Ioannou, Simon Woodroffe.