☰


Ira
Young

Dartmouth








James Craig
Watson

University of Michigan


John M.
Schaeberle

Lick Observatory


William Wallace
Campbell

Lick Observatory
?


George E.
Hale

Yerkes Observatory
?


Edward Singleton
Holden

Lick Observatory


William Hammond
Wright

Lick Observatory


Henry A.
Rowland

Johns Hopkins (Physics Tree)


Heinrich
Rubens

Universität Berlin (Physics Tree)


Robert Williams
Wood

Johns Hopkins (Physics Tree)


John M.
Schaeberle

Lick Observatory


William Wallace
Campbell

Lick Observatory


Joseph Haines
Moore

UC Berkeley


Paul Willard
Merrill

Mount Wilson Observatory

Olin Chaddock
Wilson

Mount Wilson Observatory
(Options)

Olin WilsonX