Just finishing The Food Explorer: The True Adventures of the Globe-Trotting Botanist Who Transformed What America Eats by Daniel Stone.
I heard about the book through the Gastropod podcast episode that I linked below but the book contains much more information. I've known of David Fairchild and have visited the Fairchild Tropical Botanic Garden many, many times but I found the details of his life shared in this book to be a great read. Fairchild was apparently as prolific in his note-taking and letter writing as he was in plant collecting so the author had much to draw on in creating this written portrait of a fascinating man. I recommend it.