User taxonomies 可以帮你做到这一点，我正在做类似的事情。您可以安装插件http://wordpress.org/plugins/user-taxonomies/, 并注册一个自定义分类法，虽然在我的情况下，插件有一些限制，可能会对您有所帮助。

register_taxonomy(\'profession\', \'user\', array(
\'public\'      =>true,
\'labels\'      =>array(
    \'name\'                        =>\'Professions\',
    \'singular_name\'               =>\'Profession\',
    \'menu_name\'                   =>\'Professions\',
    \'search_items\'                =>\'Search Professions\',
    \'popular_items\'               =>\'Popular Professions\',
    \'all_items\'                   =>\'All Professions\',
    \'edit_item\'                   =>\'Edit Profession\',
    \'update_item\'             =>\'Update Profession\',
    \'add_new_item\'                =>\'Add New Profession\',
    \'new_item_name\'               =>\'New Profession Name\',
    \'separate_items_with_commas\'=>\'Separate professions with commas\',
    \'add_or_remove_items\'     =>\'Add or remove professions\',
    \'choose_from_most_used\'       =>\'Choose from the most popular professions\',
),
\'rewrite\'     =>array(
    \'with_front\'              =>true,
    \'slug\'                        =>\'author/profession\',
),
\'capabilities\'    => array(
    \'manage_terms\'                =>\'edit_users\',
    \'edit_terms\'              =>\'edit_users\',
    \'delete_terms\'                =>\'edit_users\',
    \'assign_terms\'                =>\'read\',
),
));

Update