Fr Nyagilo is a priest in the Archdiocese of Nairobi as the Administrative Secretary/Judicial Vicar and the Judicial Vicar of the Metropolitan Tribunal of Nairobi. From January 2015 until 2020, Fr Nyagilo was the Director of the Canon Law National Office and Child Protection Officer for the Kenya Conference of Catholci Bishops (KCCB). 

During his tenure at KCCB, he managed to organize workshops and seminars for Clergy; Religious Men/Women and the Laity (PMC animators/Catechists/Teachers) on awareness on Safeguarding of Minors (child protection issues) by traversing all the dioceses in Kenya.

Fr Nyagilo hold a Diploma in Safeguarding of Minors, a Licentiate in Sacred Theology with specialization in Canon Law and a Higher Diploma in Psychological Counselling.