From Wikipedia:

Timothy Ferriss (born July 20, 1977) is an American authorentrepreneur, and public speaker.[1][2]

He has written a number of self-help books on the “4-hour” theme, some of which have appeared on the New York TimesWall Street Journal, and USA Today bestseller lists, starting with The 4-Hour Workweek.[11]

Ferriss is also an angel investor and advisor to FacebookTwitterStumbleUponEvernote, and Uber, among other companies.[12][13]