The simplest and most straightforward way to get the post author ID outside the loop, if you know the post ID, is to use the WordPress core function get_post_field().
$post_author_id = get_post_field( 'post_author', $post_id );
If you do not yet know the post ID of the page you are on, then since WP 3.1 the easiest thing to do is use the get_queried_object_id()(look for it in the list of Methods) function which works even outside the loop.
$post_id = get_queried_object_id();
If these do not work for you then please give a more detailed explanation of where you are trying to run your code and we can see if we can help further.
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