Yuliya Turquais

Yuliya Turquais

Yuliya (MBA) studied international trade and worked in Export Administration before coming to study at Cornerstone (2022-2024). She then joined the staff and now works in support roles. Yuliya is married to Geoffrey, and they have three kids. She likes administrative...
Wolfgang Tiedeck

Wolfgang Tiedeck

Wolfgang (MTh equivalent) studied theology in Basel, Tübingen and Wuppertal and was ordained as pastor of the Protestant Church of the Rhineland. In 1991 he joined WEC and went to the north of Ghana. His emphasis was on theological training of lay leaders (TEE.). He...
Michael Eijgenraam

Michael Eijgenraam

Michael (BA, MA, PGCE) gained his academic qualifications in the UK at London School of Theology and the Institute of Education at London University (now UCL). He was an RE teacher and head of RE in a secondary school in the UK and taught BA level courses in the...
Kim Steinfield

Kim Steinfield

Kim (MA, ICF coach) grew up as a Third Culture Kid and went into missions in 2002 after marrying Mark. Together with their 3 children, they served in Armenia and Spain before joining Cornerstone in 2024. She has led women’s ministry, taught English, served as family...
Mark Steinfield

Mark Steinfield

Mark (BTh, MA in NT) left Canada in 1998 to minister cross-culturally in Ukraine, Armenia, and Spain before joining Cornerstone in 2024. He has taught Bible and theology courses internationally, directed Bible School programs, co-pastored an international church, and...
Roos de Waaij

Roos de Waaij

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...