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I have been editing Wikipedia since 2003. Recent changes and my watchlist seem to consume most of my mainspace time, but I also enjoy piecemeal additions of well-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 edit its monthly report on recent academic research about Wikipedia, which is also published separately as the Wikimedia Research Newsletter, and co-edit the associated @WikiResearch Twitter feed.

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Other material about Wikipedia and related topics:

From 2011 to 2019 I worked for the Wikimedia Foundation, most recently as a senior data analyst.

Disclaimer: I worked for or provided services to the Wikimedia Foundation, but this is my personal account. Edits, statements, or other contributions made from this account are my own, and may not reflect the views of the Foundation.

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.