"My kids were starting college, and Harvard does not have a generous tuition benefit," Davis says.
"So I started teaching summer school as a way of paying for kids tuition," he says.
But his children have long since graduated college, and financial reasons are no longer salient.
"I keep doing it largely because I like doing it," he says.
For Davis, teaching and advising students are his lifeblood.
Unlike other professors in the sciences, Davis does not run a large laboratory research group, so he does not have to spend his summer on research.
According to Buck, many science research grants cap the amount of money professors can earn from teaching over the summer. Forced to stay in the lab, summer school teaching is not an option for such professors.
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