In the category "Science" we currently track items of 39 persons. The most popular ones, by number of traded items, are:

Neil ArmstrongBuzz AldrinFelix Baumgartner
Helen SharmanPatrick MooreCharlie Duke
Valentina TereshkovaGene CernanMichael Collins
Jim LovellEdgar MitchellMike Bannister
Dave ScottYuri GagarinAlan Bean
Jim IrwinJohn GlennScott Carpenter
Fred HaiseAl Worden 

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