Sort:  

For personal reasons, he isn't engaged in steemit anymore, as far as my understanding is. You may want to check some articles about it :)

Can you link me a good one? Thanks.

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