$post_author: WP_User Object
(
    [data] => stdClass Object
        (
            [ID] => 337
            [user_login] => chris-sullivan
            [user_pass] => 50c602901db4ec6ddddd788c1cc63e4e
            [user_nicename] => chris-sullivan
            [user_email] => [email protected]
            [user_url] => 
            [user_registered] => 2012-07-26 21:07:37
            [user_activation_key] => 
            [user_status] => 0
            [display_name] => Chris Sullivan
            [type] => wpuser
        )

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    [caps] => Array
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    [cap_key] => wp_capabilities
    [roles] => Array
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            [read] => 1
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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: Chris Sullivan [send him mail] owns a welding shop in Atlanta, Georgia and is currently working on design of exercise equipment. Visit his blog.

$bios: Array
(
    [0] => Chris Sullivan [send him mail] owns a welding shop in Atlanta, Georgia and is currently working on design of exercise equipment. Visit his blog.
)

Chris Sullivan [send him mail] owns a welding shop in Atlanta, Georgia and is currently working on design of exercise equipment. Visit his blog.