Atisha was an influential Indian Buddhist teacher and scholar who lived during the 10th and 11th centuries. He is best known for his role in the spread of Buddhism in Tibet, where he introduced the Kadampa school of thought. His teachings emphasized the importance of compassion and the practice of the Bodhisattva path. Atisha's most famous work, the "Bodhipathapradipa," serves as a guide for practitioners on how to cultivate wisdom and compassion. His efforts laid the foundation for the development of Tibetan Buddhism, and he is revered as a key figure in its history. His legacy continues to inspire many Buddhist practitioners today.