In the category "Science" we currently track items of 32 persons. The most popular ones, by number of traded items, are:

Buzz AldrinNeil ArmstrongFelix Baumgartner
Helen SharmanCharlie DukeValentina Tereshkova
Gene CernanJim LovellEdgar Mitchell
Patrick MooreMike BannisterDave Scott
Jim IrwinYuri GagarinScott Carpenter
Michael CollinsEd MitchellJohn Young
Fred HaiseJohn Glenn 

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