In the category "Science" we currently track items of 36 persons. The most popular ones, by number of traded items, are:

Buzz AldrinNeil ArmstrongFelix Baumgartner
Helen SharmanCharlie DukePatrick Moore
Gene CernanValentina TereshkovaJim Lovell
Edgar MitchellMichael CollinsDave Scott
Mike BannisterYuri GagarinAlan Bean
Jim IrwinAl WordenJohn Glenn
Scott CarpenterFred Haise 

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