Index: wp-content/themes/twentytwelve/author.php
===================================================================
--- wp-content/themes/twentytwelve/author.php	(revision 21641)
+++ wp-content/themes/twentytwelve/author.php	(working copy)
@@ -14,40 +14,24 @@
 
 		<?php if ( have_posts() ) : ?>
 
-			<?php
-				/* Queue the first post, that way we know
-				 * what author we're dealing with (if that is the case).
-				 *
-				 * We reset this later so we can run the loop
-				 * properly with a call to rewind_posts().
-				 */
-				the_post();
-			?>
+			<?php $author = get_queried_object(); ?>
 
 			<header class="archive-header">
-				<h1 class="archive-title"><?php printf( __( 'Author Archives: %s', 'twentytwelve' ), '<span class="vcard"><a class="url fn n" href="' . esc_url( get_author_posts_url( get_the_author_meta( "ID" ) ) ) . '" title="' . esc_attr( get_the_author() ) . '" rel="me">' . get_the_author() . '</a></span>' ); ?></h1>
+				<h1 class="archive-title"><?php printf( __( 'Author Archives: %s', 'twentytwelve' ), '<span class="vcard"><a class="url fn n" href="' . esc_url( get_author_posts_url( $author->ID ) ) . '" title="' . esc_attr( $author->display_name ) . '" rel="me">' . $author->display_name . '</a></span>' ); ?></h1>
 			</header><!-- .archive-header -->
 
-			<?php
-				/* Since we called the_post() above, we need to
-				 * rewind the loop back to the beginning that way
-				 * we can run the loop properly, in full.
-				 */
-				rewind_posts();
-			?>
-
 			<?php twentytwelve_content_nav( 'nav-above' ); ?>
 
 			<?php
 			// If a user has filled out their description, show a bio on their entries.
-			if ( get_the_author_meta( 'description' ) ) : ?>
+			if ( isset( $author->description ) && ! empty( $author->description ) ) : ?>
 			<div id="author-info">
 				<div id="author-avatar">
-					<?php echo get_avatar( get_the_author_meta( 'user_email' ), apply_filters( 'twentytwelve_author_bio_avatar_size', 60 ) ); ?>
+					<?php echo get_avatar( $author->ID, apply_filters( 'twentytwelve_author_bio_avatar_size', 60 ) ); ?>
 				</div><!-- #author-avatar -->
 				<div id="author-description">
-					<h2><?php printf( __( 'About %s', 'twentytwelve' ), get_the_author() ); ?></h2>
-					<p><?php the_author_meta( 'description' ); ?></p>
+					<h2><?php printf( __( 'About %s', 'twentytwelve' ), $author->display_name ); ?></h2>
+					<p><?php echo $author->description; ?></p>
 				</div><!-- #author-description	-->
 			</div><!-- #author-info -->
 			<?php endif; ?>