Oets Kolk Bouwsma

Bouwsma was born in 1898, and began teaching at the University of Nebraska in 1928, remaining there until 1968. He was then at the University of Texas until his death in 1978.

Richard Brandt

Brandt received his doctorate from Yale in 1936.

Warner Wick

Wick received the Quantrell award for excellence in undergraduate teaching from the University of Chicago in 1949, so he was presumably finished with his graduate education by then. I don't know where he did his graduate work, though.

George Schrader

Schrader received his doctorate from Yale in 1945. His dissertation was probably on Kant, but I don't have a title for it.

Rogers Albritton

Albritton received his doctorate from Princeton in 1955. Putnam is a possibility, since he was at Princeton from 1953 to 1961, but it's a bit of a tight fit.

Update: Albritton has now been listed under Robert Scoon in the tree.

Zeno Vendler

Vendler received his doctorate from Harvard in 1959, with a dissertation titled "Facts and Laws". The most plausible candidates for his advisor look to me to be Dreben, Firth, Albritton, and Scheffler, but I don't have any direct evidence for any of them, and none is a perfect fit.

Update: It looks like Vendler's advisor was probably Paul Ziff. If you know of any reason to doubt this, please let me know, but for now I'm listing it that way in the tree.

Gottlob Frege

Frege's advisors were mathematicians Ernst Schering and Rudolf Clebsch, but does he have any descendants? I know of a biological descendant (thanks to Catherine Manoukian, via Philip Kremer), but no philosophical ones. Wittgenstein and Carnap are the two closest cases, but for each of them there are more official parents. Is there anyone I'm missing?

Robert Cumming

Cumming received a doctorate from Chicago in 1950. Nothing else to go on.

Harry Frankfurt

Frankfurt received his doctorate from Johns Hopkins in 1954. I know that as of the early 1960's, the Johns Hopkins faculty included Ludwig Edelstein, Albert Hammond, Maurice Mandelbaum, George Owen, and Joseph Ullian.

Update: Harry Frankfurt has been placed under Albert Hammond in the tree.

Robert Adams

Adams was born in 1937, so was probably doing his graduate work in the early 1960s. I don't, however, find him listed anywhere on the Review of Metaphysics lists of doctorates granted. I know he was teaching at Michigan by 1970.

Update: Adams has now been placed under Nelson Pike in the tree.