From Wikipedia:
Theodore Austin-Sparks (1888 — 1971) (usually known as "T. Austin-Sparks" or just "TAS") was a British Christian evangelist.
Austin-Sparks' work at his Christian Fellowship Centre was international in scope. Many trained under his ministry became missionaries and Christian teachers. This enabled him to work closely with several well-known Christian leaders in other countries, who followed his principles for a "New Testament church pattern", notably Bakht Singh of India, Watchman Nee of China and Stephen Kaung of Richmond, Virginia.