Canon Thavasiappan was born in Vadalur, Kulasekharapatnam, South India on July 12, 1894. He was educated by the famous Canon Arthur Margoschis of Nazareth, a small town in southern Tamil Nadu. He passed the matriculation examination in Madras University and taught for a few years in the SPG Lower Secondary School at Idaiyangudi.
The Venerable Archdeacon, D.M. Gnanasihamani, seeing his family’s zeal for the ordained ministry, appointed Thavasiappan as the first assistant teacher in St. Mark's School, Christianagaram in Tamil Nadu in March 1920.
A couple of months later, he was asked to be the local honorary secretary in the Indian missionary work in Dornakal. Later, he served as the leader of children's work in the parish and as honorary catechist in Thanganagaram, a village near Christianagaram.
The proposal to send him to theological seminary was again put before the parish committee and unanimously passed. From July 1921 to June 1924, he studied various areas of church work in Nazareth and passed creditably. In the meantime, arrangements were made with Bishop Ferguson-Davie, the first bishop of the Anglican diocese of Singapore, to support Yesadian on the understanding that he would work in this diocese after finishing the theological course.
In July 1924, he came to the Anglican Diocese of West Malaysia and worked in Faith Tamil Church, Taiping, for a few months. After being made deacon on November 9, 1924 in St. Andrew's Cathedral, he was transferred to Ipoh. He was ordained priest on March 10, 1927 in St. Mary's Church, Kuala Lumpur, and continued to serve there until January 1937 with the exception of a few months in Penang from November 1935 to January 1936.
In January 1937 he took charge of the Tamil work in the Selangor parish where he remained until his death in 1951. Thus, his work covered all the four important Tamil mission centres in the federation. At Yesadian’s suggestion, the Church of the Holy Spirit in Ipoh was built by the Ven Graham White, the chaplain in south Perak. St. James' Tamil School in Kuala Lumpur was also founded through Yesadian’s efforts.
Yesadian’s ministry was characterised by vigour and fidelity as he would constantly visit his scattered flock, minister to prisoners of war or preach the Word. His pastoral work sustained many through times of trial and won disciples for Christ.
Yesadian died on December 5, 1951. A year before his death, Bishop Henry Baines installed him as an Honorary Canon of St. Andrew's Cathedral on October 26, 1950.