I think that a good question from him (in my view, and I'm not a professor I will not be able to comment anything that will be interesting about his excellent posts on the main site MathOverflow) is a post on Meta with identifier 1186 and title MathOverflow at the Joint Mathematics Meetings, Baltimore, January 2014, because the post is proactive and this looks like the initiative to build a community.
I do not know him but he evokes the best feeling to me in this post and other simple and succinct comment edited in the post of Meta MathOverflow conferences, that's "Wow, sounds great!" It's is simple and succinct comment, but it was generous and elegant adding these words for the proposal of the author of the post on Meta 5446 (I hope this project can one day come true) from the user who has the highest reputation in MathOverflow. Wow!
Many thanks for your question on Meta 1186 and your love for this site MathOverflow adding your comment in the post Meta 5446. Thank you very much for your presence on the site MathOverflow and good posts, congratulations!