William
Fyfe

Western University


Eric John
Essene

University of Michigan (GeograTree)


John W.
Valley

UW Madison (Geotree)
?




Otto
Maass

McGill






Gilbert N.
Lewis

UC Berkeley


Niels
Bohr

Copenhagen University (Physics Tree)












Robert J
Poreda

Rochester










James Fred
Hays

Harvard (Geotree)




John M.
Eiler

Caltech

Weifu
Guo

Caltech
(Options)

Weifu GuoX