Christian Bohr
Christian Bohr (1855-1911) is the father of the famous Danish physicist Niels Bohr, as well as the famous mathematican Harald Bohr.
He wrote his first scientific paper, "Om salicylsyrens indflydelse på kødfordøjelsen", at the age of 22. He received his medical degree in 1880, and was appointed professor of physiology at the University of Copenhagen in 1886.
Christian married Ellen Adler in 1881.