Despite Gray constantly seeking collectors and people to help him with the Harvard herbarium, in the first fifteen years he was at Harvard, no graduate entered botany as a career. This changed in 1858 with the arrival of Daniel Cady Eaton, who had graduated from Yale University in 1857 and came to Harvard to study with Gray. Eaton later returned to Yale to be a botany professor and oversee its herbarium, just as Gray did at Harvard. Daniel Eaton was the grandson of Amos Eaton, whose textbooks Gray had studied during his college days. Eaton influenced the teaching style of Gray, and both required practical work of their students. Gray retained the Fisher post until 1873 while living in the Asa Gray House.