Sadhguru is the founder and head of the Isha Foundation, based in Coimbatore, India. The foundation, established in 1992, operates an ashram and yoga centre that carries out educational and spiritual activities. Sadhguru has been teaching yoga since 1982. He is the author of the New York Times bestsellers Inner Engineering: A Yogi's Guide to Joy and Karma: A Yogi's Guide to Crafting Your Destiny, and a frequent speaker at international forums.
Sadriddin Ayni was a Tajik intellectual who wrote poetry, fiction, journalism, history, and a dictionary. He is regarded as Tajikistan's national poet and one of the most important writers in the country's history.
Sady Zañartu was a Chilean writer who created foundational works in the genres of Criollismo, historical anecdote, and patriotic valorization of the nation. He won the Chilean National Prize for Literature in 1974.
Sæwulf was probably the first English pilgrim to Jerusalem following its conquest in the First Crusade. His Latin written account of his pilgrimage tells of an arduous and dangerous journey; and Sæwulf's descriptive narrative provides scholars brief but significant insight into sea travel across the Mediterranean to the new Kingdom of Jerusalem that was established soon after the end of the First Crusade.