In the category "Science" we currently track items of 34 persons. The most popular ones, by number of traded items, are:

Buzz AldrinNeil ArmstrongFelix Baumgartner
Helen SharmanCharlie DukePatrick Moore
Gene CernanValentina TereshkovaJim Lovell
Edgar MitchellDave ScottJim Irwin
Mike BannisterYuri GagarinMichael Collins
Scott CarpenterJohn GlennJohn Young
Alan BeanEd Mitchell 

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