In the category "Space" we currently track items of 428 persons. The most popular ones, by number of traded items, are:

Buzz AldrinRichard TrulyHarrison Schmitt
Guion BlufordJohn GlennBill Dana
Vance BrandJames McDivittPete Conrad
Robert CrippenTom StaffordMike Melvill
Gordon FullertonJerry CarrEd Gibson
Dave ScottJerry LinengerNeil Armstrong
Jim McDivittScott Crossfield 

You can find all people that we're currently tracking items for in the alphabetical index:
A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    R    S    T    V    W    Y    Z