In the category "Space" we currently track items of 367 persons. The most popular ones, by number of traded items, are:

Charlie DukeChuck YeagerGuion Bluford
Robert CrippenEd CharlesJames McDivitt
J.T. ThomasJerry CarrScott Crossfield
Ed BookMichael CoatsJoe Kittinger
James VanJ.R. RichardJoe Engle
Robert GibsonBruce McCandlessStory Musgrave
Mike MullaneEileen Collins 

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