Display author status – i.e. author, admin, editor etc.

Anybody know how I would go about adding an authors status/role to their profile?

Currently on the author.php page, this code:

<h2><?php printf( esc_attr__( 'About %s', 'twentyten' ), get_the_author_meta( 'user_firstname' ) ); ?>
</h2>

returns this on my profile:
“About Christopher”

I want to display:
“About Christopher – Admin”

The blog has lots of writers, so another example would be:
“About Jonny” that I want to display as “About Jonny – Author”

Any ideas on the function I need?

Thanks