$post_author: WP_User Object
(
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        (
            [ID] => 174
            [user_login] => eric-margolis
            [user_pass] => 183cfeaa2c1f9611aba79ab9a2b7c37c
            [user_nicename] => eric-margolis
            [user_email] => [email protected]
            [user_url] => 
            [user_registered] => 2011-12-07 15:12:32
            [user_activation_key] => 
            [user_status] => 0
            [display_name] => Eric S. Margolis
            [type] => wpuser
        )

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    [caps] => Array
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    [roles] => Array
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            [delete_posts] => 1
            [email_single_user] => 1
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    [filter] => 
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)

get_the_author_meta: 

$bio: Eric S. Margolis [send him mail] is the author of War                at the Top of the World and the new book, American Raj: Liberation or Domination?: Resolving the Conflict Between the West and the Muslim World. See his website.

$bios: Array
(
    [0] => Eric S. Margolis [send him mail] is the author of War                at the Top of the World and the new book, American Raj: Liberation or Domination?: Resolving the Conflict Between the West and the Muslim World. See his website.
)

Eric S. Margolis [send him mail] is the author of War at the Top of the World and the new book, American Raj: Liberation or Domination?: Resolving the Conflict Between the West and the Muslim World. See his website.