Display a Logo (or Avatar) Before the Site Title - See accompanying tutorial at http://www.carriedils.com/display-logo-before-site-title/

functions.php

<?php // remove this line.

add_action( 'genesis_header', 'cd_site_image', 5 );
/**
 * Output image before site title.
 *
 * Checks to see if a header image exists. If so, output that in an `img` tag. If not, get
 * the Gravatar associated with the site administrator's email (under Settings > General).
 *
 * @see get_header_image()	Retrieve header image for custom header.
 * @see get_avatar() 		Retrieve the avatar `<img>` tag for a user.
 *
 * @return string 		HTML for site logo/image.
 */
function cd_site_image() {

	$header_image = get_header_image() ? '<img alt="" src="' . get_header_image() . '" />' : get_avatar( get_option( 'admin_email' ), 224 );

	printf( '<div class="site-image">%s</div>', $header_image );

}

style.css

.site-header .site-image img {
	border-radius: 50%;
	display: block;
	height: 100px;
	margin: 0 auto 20px;
	width: 100px;
}