Paul Werner
Gast

NASA (Geotree)


Gilbert N.
Hanson

SUNY Stony Brook (Chemistry Tree)


Charles H.
Langmuir

Columbia (Chemistry Tree)




James Fred
Hays

Harvard (Geotree)


David
Walker

Columbia (Geotree)


Paul
Niggli

ETH Zürich (Chemistry Tree)


Hans Peter
Eugster

Johns Hopkins (Geotree)




Elizabeth
Cottrell

Smithsonian National Museum of Natural History

Christoph
Popp

MeteoSwiss
(Options)

Christoph PoppX