$co_author = Array
(
    [ID] => 107
    [user_firstname] => Stephen
    [user_lastname] => Kiene
    [nickname] => stephen.kiene
    [user_nicename] => stephen-kiene
    [display_name] => Stephen Kiene
    [user_email] => stephen.kiene@accenture.com
    [user_url] => 
    [user_registered] => 2019-03-27 19:27:36
    [user_description] => 
    [user_avatar] => 
)

 $co_author = Array
(
    [ID] => 107
    [user_firstname] => Stephen
    [user_lastname] => Kiene
    [nickname] => stephen.kiene
    [user_nicename] => stephen-kiene
    [display_name] => Stephen Kiene
    [user_email] => stephen.kiene@accenture.com
    [user_url] => 
    [user_registered] => 2019-03-27 19:27:36
    [user_description] => 
    [user_avatar] => 
)