Jack Dorsey
publication date: Saturday, September 4, 2021 (part of Fall 2021)
category: 
Internet
clue: If you want to make card payments on a mobile phone, or write about it in 280 characters or less, then you need this guy's popular technologies. #busyCEO
explanation: Dorsey co-founded Twitter and founded Square, and is simultaneously the CEO of both companies. more…
intended difficulty: medium
solved by: Russ Wilhelm, Steve West, LaVonne Lemler, Samir Mehta, Chris Lemler, Richard Slominsky, Denise Sawicki, Matthew Preston, Erik Bates, and Aaron Shurtleff
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