Custom page template, based on the stock Twenty Ten theme, to produce a list of each user's WP Biographia Biography Box followed by that user's latest post. Assumes PHP 5.0 and higher.

page-biographies.php

<?php
/**
 * @package WordPress
 * @subpackage Twenty_Ten
 * @since Twenty Ten 1.0
 * Template Name: Biographies
 */

$fields = array(0 => 'ID', 1 => 'user_login');
$args = array('orderby' => 'nicename', 'fields' => $fields);
$user_query = new WP_User_Query($args);
$users = $user_query->get_results();

get_header();
?>

<div id="container">
        <div id="content" role="main">
	<?php
	foreach ($users as $user) {
		$post_args = array('author' => $user->ID,
			'post_type' => 'post',
			'posts_per_page' => 1,
			'post__in' => get_option('sticky_posts'),
			'ignore_sticky_posts' => 1
			);

		$orig_query = clone $wp_query;

		$wp_query = new WP_Query($post_args);
		if (have_posts()) {
			if (function_exists('wpb_the_biography_box')) {
				wpb_the_biography_box('raw', $user->user_login);
			}
			get_template_part('loop', 'single');
		}
		wp_reset_postdata();
		$wp_query = clone $orig_query;
	}	// end-foreach ($users ...)
	?>
	</div>
</div>

<?php
get_sidebar();
get_footer();

?>