Who Contributes to PostgreSQL Development?

In a talk which I gave at PGCONF.IN and, in a shorter version, at PGCONF.US, I had a few slides on who contributes to PostgreSQL development.  Here, I'd like to present a slightly expanded version of the information which was in the talk.  The information in this post considers calendar year 2016 and comes from two sources.

New Features Coming in PostgreSQL 10

The list of new features coming in PostgreSQL 10 is extremely impressive.  I've been involved in the PostgreSQL project since the 8.4 release cycle (2008-2009), and I've never seen anything like this.  Many people have already blogged about these features elsewhere; my purpose here is just to bring together a list of the features that, in my opinion, are the biggest new things that we can expect to see in PostgreSQL 10.  [Disclaimers: (1) Other people may have different opinions.  (2) It is not impossible that some patches could be reverted prior to release.  (3) The list below represents the work of the entire PostgreSQL community, not specifically me or EnterpriseDB, and I have no intention of taking credit for anyone else's work.]