Sr. Ondeng is a Kenyan and a member of the congregation of the School Sisters of Notre Dame (Africa).  She is a psychologist by profession. She is the coordinator of Safeguarding Initiatives at Tangaza University College in Nairobi. 

Upon completion of a Diploma in Child Protection at the Centre for Child Protection (CCP) of the Pontifical Gregorian University, Rome, she spearheaded the development and implementation of a core Course in Safeguarding at the School of Theology – Tangaza University College.

She remains a resource person in Safeguarding for young women and men in formation, clergy and religious communities in and beyond Africa.