By CNNMoney Staff @CNNMoney June 5, 2015: 3:08 PM ET
Stewart Butterfield
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Butterfield, 42, cofounded photo-sharing site Flickr, which sold to Yahoo(YHOO) in 2005 for $25 million. Most recently, he cofounded communications platform Slack, which has raised $340 million and is valued at $2.8 billion.
Best advice:
"Every job you do has your signature on it. Do you want to sign your name to that?"
-- My father, to an 11-year-old me, in reference to a very poorly-stacked pile of firewood.
"Don't become an academic: If you're interested in this stuff, you can subscribe to the journals and go to the conferences, but don't actually become a professor."
-- My favorite professor to a 22-year-old me, then on a path to becoming a philosophy professor.
