
He was elected the bishop at Tirunelveli in 1939. He believed that all churches should unite and no church should be left out as not being in communion. There he became involved in negotiations for uniting the churches in South India for the formation of Church of South India. He taught Tamil in the CMS theological college in Palayamkottai where he served as its first Principal. After his ordination he moved to Tirunelvely and later led Thomas Ragland's North Tirunelveli Itineracy evangelism program.

Neill joined the Church Missionary Society (CMS) in 1928 and was ordained a priest.

While at Dohnavur he learnt Tamil and was involved in teaching schoolboys. In 1925 he moved to Dohnavur with his parents.
