I'd just like to mention Roy Calne, transplant pioneer, humanist, skeptic. Only died last year, at 93.

https://en.wikipedia.org/wiki/Roy_Calne

> Sir Roy Yorke Calne FRS FRCS (30 December 1930 – 6 January 2024) was a British surgeon and pioneer in organ transplantation. He was part of the team that performed the first liver transplantation operation in Europe in 1968, the world's first liver, heart and lung transplantation in 1987, the first intestinal transplant in the UK in 1992 and the first successful combined stomach, intestine, pancreas, liver and kidney cluster transplantation in 1994.