I am most active on English Wikipedia and Wikimedia Commons, but I occasionally use other Wikimedia projects, too. Most of those user pages point here, so if I don't respond to you on other language Wikipedias, Meta-Wiki, Outreach Wiki, Wikinews, Wikibooks, Wikiversity, Wiktionary, Wikisource, Incubator, Strategy, or MediaWiki, you can nudge me on my talk page here or send an email.
I tend to edit in a wide variety of topic areas—to such an extent that even as I think about it, it's hard to point to topic area concentrations. Here are a few memorable articles (not necessarily the top by quality).
This is my main account for editing Wikipedia. I have another, User:Ryan (Wiki Ed), which I use in my capacity as an employee of Wiki Education. I am also affiliated with WikiNYC and engage in a variety of Wikipedia-related activities both online and offline. Leave me a message if you want to talk about Wikipedia research, Wikipedia in education, or New York-area events/partnerships.
rhododendrites AT gmail DOT com