Harold Armstrong Baker (1881–1971), known as H.A. Baker, was an American author and Pentecostal missionary to Tibet from 1911 to 1919, to China from 1919 to 1950, when forced to leave the mainland, and then in Taiwan from 1955 until his death in 1971.
With his wife and co-worker Josephine, Pastor Baker began the Adullam Rescue Mission for street children in Yunnan Province, China. The children in the home, mostly boys aged from six to eighteen, began to have spiritual experiences, claiming to have seen Heaven through a series of visions. These visions were recounted in Baker's book Visions Beyond the Veil.
He was also the author of Heaven and the Angels, Plains of Glory and Gloom, The Three Worlds, Tribulation to Glory, Through Tribulation, V
