Public Service

Starting 1 July 2025: ACM SGB Member-at-Large
Since April 2025: Member of the ACM Technology Policy Council
Since June 2023: Chair of ACM SIGWEB
Since 2013: Board member of User Modeling Inc.
2019-2023: Vice Chair of ACM SIGWEB
2007-2015: Chair of the German SIG ABIS within the German Gesellschaft für Informatik e.V.

Conference Organization

Below is a selection of conferences in which I am or was involved in the organizing committee.

General Chair for UMAP 2021
General Chair for UMAP 2017
General Chair for Hypertext 2016
Program Chair for Hypertext 2014
Poster and Demo Chair for Intelligent User Interfaces 2015
Poster and Demo Chair for UMAP 2013
Workshop and Tutorial Chair for UMAP 2012
Publicity Chair for CHI 2012
Publicity Chair for UMAP 2010 and UMAP 2011
Co-organizer of several workshops at UMAP, ESWC and IUI
Local Chair for Adaptive Hypermedia 2008
Chair of the German workshop on Adaptivity and User modelling in Interactive Systems ABIS 2006, ABIS 2010 and ABIS 2012

I am regularly invited to perform reviews for various scientific journals, among which: