The man depicted above is Dr. Bernard Wheatley who, after the deaths of his family, chucked a flourishing career to live as a hermit on the Hawaiian island of Kauai.
Read a long and fascinating article about him here.
In 1957 Dr. Bernard Wheatley - an African American physician from the Virgin Islands - made a pilgrimage to Kalalau Valley. Distraught after the death of his wife and son in a car accident, he kept questioning the meaning of life and other ontological problems until the answers finally came. In a remarkable religious conversion-like revelation he realized that life is eternal. He abandoned his medical practice, sold all his worldly possessions and sought a quiet, secluded place where he could earnestly seek truth without distraction. He arrived on the remote Island of Kauai and after seeing Kalalau from a ridge-top lookout in Kokee, he knew that he had found his home.... He passed on December 3, 1991 at the age of 72. His ashes were spread in Kalalau.