$co_author = Array
(
    [ID] => 198
    [user_firstname] => Andrew
    [user_lastname] => Woolf
    [nickname] => andrew.woolf
    [user_nicename] => andrew-woolf
    [display_name] => Andrew Woolf
    [user_email] => andrew.woolf@accenture.com
    [user_url] => 
    [user_registered] => 2020-04-08 22:14:24
    [user_description] => 
    [user_avatar] => 
)

 $co_author = Array
(
    [ID] => 198
    [user_firstname] => Andrew
    [user_lastname] => Woolf
    [nickname] => andrew.woolf
    [user_nicename] => andrew-woolf
    [display_name] => Andrew Woolf
    [user_email] => andrew.woolf@accenture.com
    [user_url] => 
    [user_registered] => 2020-04-08 22:14:24
    [user_description] => 
    [user_avatar] => 
)