A Biography of Ajahn Sao

Sao Kantasilo, Phra Ajaan (1861-1941)

Ajaan Sao and his student Ajaan Mun established the Kammatthana tradition. A true forest-dweller, Ajaan Sao left no written records of his teachings. Another of his students — Phra Ajaan Phut Thaniyo — did, however, record some of them in Ajaan Sao's Teaching: A Reminiscence of Phra Ajaan Sao Kantasilo, giving us a tantalizing glimpse into Ajaan Sao's terse but powerful teaching style.

Reference:http://www.accesstoinsight.org/lib/thai/index.html