In addition to my contributions to the core MediaWiki software, I have written lots of extensions on my own and contributed code to many extensions not written by me originally.
I've also had a major role at open-sourcing some major projects using MediaWiki, namely Wikia, ArmchairGM and wikiHow.
In addition, I'm a bureaucrat on this wiki; if you need my assistance (i.e. you'd like to request a rename, a promotion or you would like to have some code commits reviewed), please do not hesitate to contact me.
Since March 2012, when MediaWiki and the majority of maintained extensions were forcibly moved into git and we switched to gerrit as the code review tool, I haven't been very active with MediaWiki development due to multiple reasons, of which the biggest two are git and gerrit.
I've been a staff member (Head of the Customer Support Team) at ShoutWiki since its very foundation (2007).