Luang Por Ajahn Sumedho (born Robert Kan Jackman, July 27, 1934, Seattle) is the senior Western representative of the Thai forest tradition of Theravada Buddhism. He was abbot of Amaravati Buddhist Monastery, UK, from its consecration in 1984 until his retirement in 2010. Luang Por means Venerable Father, an honorific and term of affection in keeping with Thai custom; ajahn means teacher. A bhikkhu for 45 years, Sumedho is considered a seminal figure in the transmission of the Buddha's teachings to the West.
More from Wikipedia: http://en.wikipedia.org/wiki/Ajahn_Sumedho
Below are selected talks by Luang Por Sumedho: