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
Valentina TereshkovaGene CernanJim Lovell
Edgar MitchellDave ScottYuri Gagarin
Jim IrwinMike BannisterMichael Collins
Scott CarpenterJohn GlennAlan Bean
John YoungEd 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