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Ooh you'll have fun with google. I just typed 'Dan leaving steemit' when I first came across an article mentioning it, wasn't around at the time yet. You'll get TONS of recommended reads! Choose one that takes your fancy.
Here is one for a starter:
http://www.razor-forex.com/2017/03/steemit-lead-developer-dan-larimer.html?m=1