[Brian M Scott](http://meta.math.stackexchange.com/users/12042/brian-m-scott)

Apart from being a great mathematician, he cares a lot for the community.

As can be seen for example from his good contributions to the list of questions to the candidates [here](http://meta.math.stackexchange.com/a/17615/36639), [here](http://meta.math.stackexchange.com/a/17617/36639), and [here](http://meta.math.stackexchange.com/a/17616/36639), he nicely represents and defends the original traditions and standards of the community, which made Math SE a good place with a nice academic atmosphere for people who want to help each other learning and doing mathematics together.