Thích Nhất Hạnh was a Vietnamese Thiền Buddhist monk, peace activist, prolific author, poet and teacher, who founded the Plum Village Tradition, historically recognized as the main inspiration for engaged Buddhism. Known as the "father of mindfulness", Nhất Hạnh was a major influence on Western practices of Buddhism.

Thiền Buddhism is the Vietnamese version of Zen Buddhism. Thiền is the Sino-Vietnamese pronunciation of the Middle Chinese word 禪 (chán), an abbreviation of 禪那 (chánnà), which is a transliteration of the Sanskrit word dhyāna ("meditation").