$args = array(
    'numberposts' => 10,
    'offset' => 0,
    'category' => 0,
    'orderby' => 'post_date',
    'order' => 'DESC',
    'post_type' => 'post',
    'post_status' => 'publish',
    'suppress_filters' => true
  );

  $recent_posts = wp_get_recent_posts( $args, ARRAY_A );

foreach ($recent_posts as $post) {
 $user_id = get_the_author_meta('ID', true) // is this correct
 // Is there a function that I need to pass the post ID ($post["ID"])?
 var_dump($user_id);
}