How do I dynamically call a page/post author into the meta data?

Yes, it is. Add this code to your theme’s functions.php:

function my_wp_head_action() {
    // must be a single post/page
    if( is_page() || is_single() ) {
        $post = get_post();
        $author = get_user_option( 'display_name', $post->post_author );
        echo '<meta name="author" content="'. esc_attr( $author ) .'" />';
    }
}
add_action( 'wp_head', 'my_wp_head_action' );

Or, if you really want to control a position of your meta line within <head> ... </head> block, modify header.php template, and put this code, where you want it:

<?php
if( is_page() || is_single() ) {
    $post = get_post();
    $author = get_user_option( 'display_name', $post->post_author );
    echo '<meta name="author" content="'. esc_attr( $author ) .'" />';
} ?>

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