In the category "Science" we currently track items of 38 persons. The most popular ones, by number of traded items, are:

Buzz AldrinNeil ArmstrongFelix Baumgartner
Helen SharmanPatrick MooreCharlie Duke
Valentina TereshkovaGene CernanJim Lovell
Edgar MitchellYuri GagarinMike Bannister
Dave ScottAlan BeanJim Irwin
John GlennMichael CollinsScott 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