random.php

<?php
add_action( 'wp_head', 'pagelines_google_author_head' );
function pagelines_google_author_head() {
	global $post;

	if( ! is_page() && ! is_single() && ! is_author() )
		return;

	$google_profile = get_the_author_meta( 'google_profile', $post->post_author );

	if ( '' != $google_profile )
		printf( '<link rel="author" href="%s" />%s', $google_profile, "\n" );
}