Natürlich ist das denkbar. Studenten höherer Semester sind oft Tutoren für die Jüngeren.

Es wäre doch auch möglich, dass er an einer Eliteuni ausgebildet wurde (gelernt hat) und später dort auch gelehrt hat.

I'd be inclined to see it as learning as a student, then later teaching as a lecturer or whatever---and the temporal division would also be prefigured in the verbs "came from" and then "flourished."

(In GB universities, it isn't usual for second or third-year students to teach first or second-year students, or at least it wasn't in my day.)

While I'm not sure entirely sure about it (having studied at a "lowly" state university, I suspect Harvard and the other Ivy League schools have TAs (teaching assistants) teaching sections or assisting in the instruction of lower-level classes as well. Contrary to Phillipp's post, these are graduate students (using the AE understanding of the term, i.e. persons who have received their Bachelor and are studying for either their Master or PhD. "Third and fourth-year" students in the US would be juniors and seniors -- the last 2 years before receiving their Bachelor degree.)