Post 2 Post: Getting connected ‘person’ from post author

On single post, try something like this:

$author_id = get_the_author_meta('ID');

$people = get_posts( array(
  'connected_type' => 'people_to_user', // replace with whatever
  'connected_items' => $author_id,
  'suppress_filters' => false,
  'nopaging' => true
) );

Now $people[0] references the first (and only) author related to the post you’re on. So $people[0]->ID can be used to get the various bits of content, thumbnail, custom meta, etc.