$co_author = Array
(
    [ID] => 87
    [user_firstname] => Kate
    [user_lastname] => Sullivan
    [nickname] => KateSullivan
    [user_nicename] => katesullivan
    [display_name] => Kate Sullivan
    [user_email] => k.sullivan@accenture.com
    [user_url] => 
    [user_registered] => 2019-04-16 17:54:48
    [user_description] => 
    [user_avatar] => 
)