The following had an impact on me: Tony Robbins http://www.ted.com/index.php/talks/tony_robbins_asks_why_we_do_what_we_do.html http://www.ted.com/index.php/ta

The following had an impact on me: Tony Robbins http://www.ted.com/index.php/talks/tony_robbins_asks_why_we_do_what_we_do.html http://www.ted.com/index.php/talks/tony_robbins_asks_why_we_... Daniel Gilbert http://www.ted.com/index.php/talks/dan_gilbert_asks_why_are_we_happy.html http://www.ted.com/index.php/talks/dan_gilbert_asks_why_are_... Mihaly Csikszentmihalyi http://www.ted.com/index.php/talks/mihaly_csikszentmihalyi_on_flow.html http://www.ted.com/index.php/talks/mihaly_csikszentmihalyi_o... It's hard for me to pick a favorite. I hope at least one of them is useful to you.