George Chapman (1921-2006) was a British trance medium reputed to channel the spirit of William Lang (1852-1937), an ophthalmic surgeon. The partnership is said to have brought about numerous healings. Author J Bernard Hutton, a satisfied patient, interviewed 153 other former patients and gathered verifications.
https://psi-encyclopedia.spr.ac.uk/articles/george-chapmanwilliam-lang
https://psi-encyclopedia.spr.ac.uk/articles/george-chapmanwilliam-lang