Hans G. K. Hummel PhD is associate professor working at the Faculty of Educational Sciences of the Open University of the Netherlands. Hans holds 30 years of experience with research and development of technology-enhanced learning about workplace-based professional competences. He was responsable for the instructional design of around 100 online interactive educational programs, including more than 30 serious games. He (co)authored 100+ scientific articles on the effectiveness and quality of such interactive programs. Hans initiated and lead the ‘EMERGO’ project (2006–2008) that delivered both a dedicated design approach and toolkit for developing serious games that foster the acquisition of complex skills. This approach and toolkit have been (and still are) succesfully used and extended in a variety of domains, educational contexts, and across countries. Hans also chaired the research program on ‘Workplace learning and TEL’ (2009–2014) at the NHL University of Applied Science in the Netherlands.