He received the PhD degree cum laude in computer science from Delft University of Technology in 2009. He was a software engineer at WEST consulting (2001-2005) and a researcher at the Dutch National Institute for Research in Mathematics and Computer Science (2005-2006). His main area of research is software engineering, with an emphasis on software testing and dynamic analysis of modern web- based systems. He is the recipient of an ACM SIGSOFT Distinguished Paper Award at the ACM/IEEE International Conference on Software Engineering (ICSE 2009).