I don't know much about him. There is a Photo of him here:http://www.vimutti.org.nz/lineage.php
Mention of him here:
Luang Pho Waen was born on 16 February 1883 (BE 2431) in Tambon Na Pong, Mueang District of Loei, Northeast (Isan) of Thailand to a blacksmith's family. He was named Yarn and had one elder sister. He ordained as a novice in 1892 at Wat Bodhi Chai in Na Pong at the age of nine to fulfill the wish of his mother when she died while he was five years old. At the age of 13, he became a Naen (novice monk) at Wat Poh Chai, Loei province. He studied with a number of teachers and later ordained as a monk at a temple in Hua Taparn District of Ubon Ratchathani at the age of 21.
As a novice monk, he studied the Dharma and Pali, even at that young age he showed exceptional ability. He eventually went Thudong (forest monk) with his teacher, Ajahn Wuhan, travelling from Loei to Ubon Ratchathani, where he remained to learn Dhamma from another teacher, Ajahn Sing.http://webcache.googleusercontent.com/s ... clnk&gl=au
And (perhaps ?) another mention here:The Relics of Saints
In the display case stand urns containing the relics of Venerable Ajahn Sao Kantasilo Mahathera, Venerable Ajahn Mun, and Venerable Acariya Sing Khatayakhamo
of Wat Pa Salawan. There also are pictures of the Elder Meditation Masters who followed them in the forest meditation tradition. These include: Venerable Acariya Waen Suchinno, Venerable Acariya Khao Analayo , Venerable Ajahn Lee Dhammadharo of Wat Asokaram, and Venerable Ajahn Fun Ajaro.http://en.wikipedia.org/wiki/Wat_Pa_Ban_Tat