I have been editing Wikipedia since 2003. My watchlist seems to consume most of my mainspace time, but I also enjoy piecemeal additions of referenced information.
I have long appreciated the Signpost, the English Wikipedia's community-edited weekly newspaper (having commended its journalist values as early as 2005 during a discussion on de:). I started contributing to the Signpost myself in 2009, and from June 2010 to July 2011 acted as its editor-in-chief. I still co-edit its monthly report on recent academic research about Wikipedia, which is also published separately as the Wikimedia Research Newsletter.
- More Meta
Other material about Wikipedia and related topics:
- "CheckUser and Editing Patterns - Balancing privacy and accountability on Wikimedia projects": Talk at Wikimania 2008 (abstract,slides and notes)
- "Privacy, openness, trust and transparency on Wikipedia. How the free encyclopedia project deals with sockpuppets", related talk at 26C3, 2009 (abstract, slides and notes)
- "Lessons from Citizendium": Talk at Wikimania 2009 (abstract, slides and notes), advocating a Wikipedians' view on Citizendium not as a rival, but as a valuable testing ground for several policy changes. Examining the problems with one of them gave rise to a list of errors in Citizendium's expert-approved articles.
- "Timeline of distributed Wikipedia proposals": A survey of the - surprisingly frequent but as yet inconsequential - proposals for some kind of distributed Wikipedia (abolishing the principle that there is only one current article version for each topic), and more specifically, proposals to apply the principles of distributed revision control (as exemplified by Git in software development) to wikis in general and Wikipedia in particular.
- "Academic research about the reliability of Wikipedia" (slides from a talk at a zhwiki meetup, January 2012)
In July 2011 I started working as a contractor for the Wikimedia Foundation, supporting movement communications, and became a regular employee in May 2012. See also my work account. Although I work for the Wikimedia Foundation, contributions under this account are exclusively in my individual, personal capacity.
I was known as "User:High on a tree" from December 2003 to June 2008, when I changed my user name to "HaeB" ("High on a tree" initialismized in German) for consistency with my nick on de:, and to save bandwidth ;-)
I was a CheckUser on de: from July 2006 until October 2011 (I decided not to run for reelection after starting to work for WMF). I am also active on Commons.