He introduced peer review, and expanded production from 6 issues per year to more than 20 per year.[1] Koen Martens took over the responsibility as editor-in-chief in 2003, with the aim of increasing the relevance and impact of the journal to a broader readership. In 2015, due to the increase in the number of submissions, three associate editors-in-chief started helping him to manage a group of about 45 academic editors.[2]