Khantibalo Bhikkhu, the Director of the Willpower Institute, Wat Dhammamongkol, Sukhumvit 101, and Dr. Banjob Bannaruji, the Director of the Spiritual Development Institute, the World Buddhist University. They experienced the Samadhi practice with Phra Dhammamongkolnan (Luang Phor Viriyang), who was once a student of Luang Poo Man, a best wellknown forest monk in northeastern part of Thailand, and who is now regarded as the great Samadhi master in Canada, where he succeeds in teaching meditation that leads to the constant increasing of new practitioners.