Roos 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. They were involved in church-planting and Roos also home-schooled her children. She joined staff at Cornerstone in the summer of 2017 and will be involved in teaching. She enjoys all sorts of creativity, cooking and art.