• first logins: de.wiki May 1st, 2004, cs.wiki: May 1st, 2004, multilingual wikisource (wikisource.org): August 15th, 2004
• November 2nd, 2004 - January 2006 sysop cs.wiki (self resigned)
• October 11th, 2005: sysop multilingual wikisource, March 8th, 2011 bureaucrat (up to now)
• March 30th 2006 created the Czech wikisource, the first bureaucrat and sysop there (May 2009 self-resigned to bct), sysop till April 2020
• 2009/2010 OTRS
• about 2009 to 2019 admin & bureaucrat at wikilivres and partly CU
• February 19th 2011 mentor (adopt-a-user) on de.wiki (about 2013 self-resigned)
• June 1st 2011 - May 31st 2012 and June 1st, 2017 - November 4th, 2017 member of the arbcom de.wiki
• May 1st, 2012 - May, 2015 sysop de.wiki (self-resigned)

attended WikiCons 2011 Nürnberg, 2015 Dresden, 2017 Leipzig; arbcom meeting 2012 Frankfurt; AdminCons 2015 Oer-Erkenschwick, 2016 Cuxhaven, 2017 Salzburg; WMF Hackathon 2016 Jerusalem

Pages created (namespace 0, as per Juli 2020): dewiki nearly 660 articles, cswiki over 320 articles, some more hundreds on cs.wikisource and multilingual wikisource
uploads to commons: some more hundreds (see here and galleries)
edit counter (as per Sept. 2019): de.wiki over 88.200 edits, cs.wiki over 11.340 edits, cs + multi wikisources about 12.000 edits, all projects 116.350 edits

others items: wikilivres april 29th, 2009 sysop and later cu (up to approx. 2017); member of WMDE; SUL activity; 2010 (with Merlissimo) consulting frr.wiki after its creation