This will customize the Author Box display in Genesis 1.0+ HTML5. Just drop it in your child theme's functions.php file.

author-box.php

<?php
// Don't copy the opening php tag

// Modify the author box display
remove_action( 'genesis_after_entry', 'genesis_do_author_box_single', 8 );
add_action( 'genesis_before_comments', 'wsm_author_box', 8 );
remove_action( 'genesis_before_loop', 'genesis_do_author_box_archive', 15 );
add_action( 'genesis_before_loop', 'wsm_author_box', 8 );

function wsm_author_box() {
	
	$authinfo = '';
	$authdesc = get_the_author_meta('description');
	
	if( !empty( $authdesc ) ) {
		$authinfo .= sprintf( '<section %s>', genesis_attr( 'author-box' ) );
		$authinfo .= '<h3 class="author-box-title">';
		$authinfo .= __( 'About ', 'wsm' );
		$authinfo .= '<span itemprop="name">';
		$authinfo .= get_the_author_meta( 'display_name' );
		$authinfo .= '</span>';
		$authinfo .= '</h3>';
		$authinfo .= get_avatar( get_the_author_id() , 90, '', get_the_author_meta( 'display_name' ) . '\'s avatar' ) ;
		$authinfo .= '<div class="author-box-content" itemprop="description">';
		$authinfo .= '<p>' . get_the_author_meta( 'description' ) . '</p>';
		$authinfo .= '</div>';
		$authinfo .= '</section>';
	}
	if ( is_author() || is_single() ) {
		echo $authinfo;
	}
}