It is a modified version of ET_Book called ET_Bembo:
replyI love u. thanks!
replyapparently its the font used in Edward Tufte's books. Its on github: https://edwardtufte.github.io/et-book/
replyThe "Quantitative Display of Information", which I just checked, is using Monotype Bembo. So still Bembo, but a different version.
replyFont is atrocious.
replyUppercase letters have different stroke width than lowercase ones — it’s like they are *B*old *L*ike this.
Not only that: tracking, kerning is basically non-existent.
Please don’t use that open-source font
You need real paid Bembo, not that piece of shit.