In the category "Science" we currently track items of 48 persons. The most popular ones, by number of traded items, are:

Buzz AldrinNeil ArmstrongFelix Baumgartner
Helen SharmanCharlie DukePatrick Moore
Valentina TereshkovaEdgar MitchellMichael Collins
Gene CernanJohn GlennJim Lovell
Dave ScottAlan BeanMike Bannister
Yuri GagarinJim IrwinScott Carpenter
Al WordenFred Haise 

You can find all people that we're currently tracking items for in the alphabetical index:
A    B    C    D    F    G    H    I    K    L    M    S    T    W    Y