$co_author = Array
(
    [ID] => 135
    [user_firstname] => Mark
    [user_lastname] => Quigley
    [nickname] => mark.g.quigley
    [user_nicename] => mark-g-quigley
    [display_name] => Mark Quigley
    [user_email] => mark.g.quigley@accenture.com
    [user_url] => 
    [user_registered] => 2019-08-19 21:19:01
    [user_description] => 
    [user_avatar] => 
)