Roos (BA, MA Missiology) and her husband Arjan served in Zambia for a year before starting their studies at Cornerstone. After completing these studies in 2010, Roos, Arjan and their four children spent five years in Burkina Faso and Mali, where Roos worked with prisoners, refugees and taught Bible classes in local churches. For three years she home-schooled her children. She joined staff at Cornerstone in the summer of 2017 and is involved in teaching and organizing events. She enjoys all sorts of creativity, gardening, cooking and art.