Vasja Vehovar, PhD is a professor of statistics at the Faculty of Social Sciences, University of Ljubljana, Slovenia, and the head of Centre for Social Informatics (cdi.si). In recent years his main research interest has been web survey methodology. Within this context, he led methodological experiments with web surveys in 1996, co-established the WebSM.org site in 1998, published series of papers and chapters with leading publishers, launched open-source software for web surveys (1KA), and in 2015 co-authored the monograph Web Survey Methodology (Sage).
Katja Lozar Manfreda is an associated professor of statistics at the Faculty of Social Sciences, University of Ljubljana, Slovenia. Her doctoral thesis (2001) was globally the first one in the area of web survey methodology. She was also among the founders of the WebSM site in 1998. She publishes in the area of web surveys and her most cited work (Lozar Manfreda et al. 2008) has become a citation classic.