[shorthistory]

Was it only 18 months?

Wikipedia states: ...he returned there full-time after graduating [in 2014]. In September 2017, Bankman-Fried quit Jane Street...

Seems closer to 3 years, but it doesn't state whether he started there immediately after graduating or not.

What do you suggest are the reasons for his leaving?

[FabHK]

GP was talking about the CEO of Alameda, who, according to page linked by GGP, is

> Caroline Ellison, CEO > Before joining Alameda in 2018, Caroline worked at Jane Street as a trader on the equities desk.

You seem to be talking about SBF.