$co_author = Array
(
    [ID] => 146
    [user_firstname] => Markus
    [user_lastname] => Naumer
    [nickname] => markus.naumer
    [user_nicename] => markus-naumer
    [display_name] => Markus Naumer
    [user_email] => markus.naumer@accenture.com
    [user_url] => 
    [user_registered] => 2019-10-10 14:47:51
    [user_description] => 
    [user_avatar] => 
)