Staff Grid in Genesis with clickable featured images opening Excerpts in a lightbox popup. http://sridharkatakam.com/staff-grid-genesis-clickable-featured-images-opening-excerpts-lightbox-popup/

archive-staff.php

<?php
/**
 * This file adds the custom staff post type archive template.
 *
 */

//* Force full width content layout
add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_full_width_content' );

//* Remove the breadcrumb navigation
remove_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' );

//* Remove post title
remove_action( 'genesis_entry_header', 'genesis_do_post_title' );

//* Remove the post info function
remove_action( 'genesis_entry_header', 'genesis_post_info', 12 );

//* Remove the post content
remove_action( 'genesis_entry_content', 'genesis_do_post_content' );

//* Remove the post image
remove_action( 'genesis_entry_content', 'genesis_do_post_image', 8 );

//* Add staff-grid-archive body class
add_filter( 'body_class', 'sk_add_staff_body_class' );
function sk_add_staff_body_class( $classes ) {

	$classes[] = 'staff-grid-archive';
	return $classes;

}

/**
 * Display as Columns
 *
 */
function be_portfolio_post_class( $classes ) {
	$columns = 4;

	$column_classes = array( '', '', 'one-half', 'one-third', 'one-fourth', 'one-fifth', 'one-sixth' );
	$classes[] = $column_classes[$columns];
	global $wp_query;
	if( 0 == $wp_query->current_post || 0 == $wp_query->current_post % $columns )
		$classes[] = 'first';

	return $classes;
}
add_filter( 'post_class', 'be_portfolio_post_class' );

add_action ('genesis_before_loop', 'sk_staff_grid_title');
function sk_staff_grid_title() {

	echo '<h1 itemprop="headline" class="staff-section-title">Staff Members</h1>';

}

//* Featured image, post title and meta
add_action( 'genesis_entry_header', 'sk_staff_grid' );
function sk_staff_grid() {

	if ( $image = genesis_get_image( 'format=url&size=staff' ) ) {
		printf( '<div class="staff-featured-image"><a href="%s" target="foobox" data-width="650px" data-height="230px" rel="bookmark"><img src="%s" alt="%s" /></a></div>', thefooboxcontent(), $image, the_title_attribute( 'echo=0' ) );

		echo '<div class="title-meta">';
			genesis_do_post_title();
			genesis_post_meta();
		echo '</div>';
	}

}

//* Construct the link for each featured image. Ex.: #staff-member1 for latest Staff post, #staff-member2 for the post before that and so on..
function thefooboxcontent() {

	// return '#staff-member' . get_the_ID();
	global $wp_query;
	return '#staff-member' . ($wp_query->current_post + 1);
}

//* Remove the post meta function
remove_action( 'genesis_entry_footer', 'genesis_post_meta' );

add_action ( 'genesis_after_entry', 'display_foobox_content' );
function display_foobox_content() {

	// echo '<div id="staff-member' . get_the_ID() . '" style="display: none;"><div class="lightbox-content">'; genesis_do_post_title();
	global $wp_query;
	echo '<div id="staff-member' . ($wp_query->current_post + 1) . '" style="display: none;"><div class="lightbox-content">'; genesis_do_post_title();
	echo '<p>'. get_the_excerpt() . '</p></div></div>';

}

//* Modify the Excerpt read more link
add_filter('excerpt_more', 'new_excerpt_more');
function new_excerpt_more($more) {

	return '... <a class="more-link" href="' . get_permalink() . '">Read More</a>';

}

//* Customize the previous page link
add_filter ( 'genesis_prev_link_text' , 'sp_previous_page_link' );
function sp_previous_page_link ( $text ) {
	return g_ent( '&laquo; ' ) . __( 'Previous Page', CHILD_DOMAIN );
}

//* Customize the next page link
add_filter ( 'genesis_next_link_text' , 'sp_next_page_link' );
function sp_next_page_link ( $text ) {
	return __( 'Next Page', CHILD_DOMAIN ) . g_ent( ' &raquo; ' );
}

genesis();

functions.php

//* Add new image size for Staff members
add_image_size( 'staff', 300, 400, true );

//* Show Staff Type custom taxonomy terms and tags in Staff archive pages
add_filter( 'genesis_post_meta', 'custom_portfolio_post_meta' );
function custom_portfolio_post_meta( $post_meta ) {

	if ( is_post_type_archive( 'staff' ) || is_singular( 'staff' ) || is_tax('staff-position') )
	$post_meta = '[post_terms taxonomy="staff-position" before="Position: "]<br/>[post_tags before="Tagged With: "]';

	return $post_meta;

}

/**
 * Template Redirect
 * Use archive-staff.php for staff-position taxonomy archive.
 */
add_filter( 'template_include', 'sk_template_redirect' );
function sk_template_redirect( $template ) {

	if ( is_tax( 'staff-position' ) )
		$template = get_query_template( 'archive-staff' );
	return $template;

}

single-staff.php

<?php
/**
 * This file adds the custom staff post type single post template.
 *
 */

//* Force full width content layout
// add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_full_width_content' );

//* Remove the breadcrumb navigation
// remove_action( 'genesis_before_loop', 'genesis_do_breadcrumbs' );

//* Remove the post info function
remove_action( 'genesis_entry_header', 'genesis_post_info', 12 );

//* Remove the author box on single posts
remove_action( 'genesis_after_entry', 'genesis_do_author_box_single', 8 );

//* Remove the post meta function
// remove_action( 'genesis_entry_footer', 'genesis_post_meta' );

//* Add the featured image
add_action( 'genesis_entry_content', 'sk_show_featured_image', 9 );
function sk_show_featured_image() {

	if ( $image = genesis_get_image( 'format=url&size=staff' ) ) {
		printf( '<div class="staff-featured-image-sigle"><img src="%s" alt="%s" class="alignleft" /></div>', $image, the_title_attribute( 'echo=0' ) );

	}

}

//* Previous and Next Post navigation
add_action('genesis_after_entry', 'sk_custom_post_nav');
function sk_custom_post_nav() {

	echo '<div class="prev-next-post-links">';
		previous_post_link('<div class="previous-post-link">&laquo; %link</div>', '<strong>%title</strong>' );
		next_post_link('<div class="next-post-link">%link &raquo;</div>', '<strong>%title</strong>' );
	echo '</div>';

}

genesis();

style.css

/* Staff Grid
--------------------- */

.staff-section-title {
	font-size: 30px;
	font-weight: bold;
	margin-bottom: 30px;
}

.staff-grid-archive .content .entry-header,
.staff-profile {
	position: relative;
}

.staff-featured-image img {
	vertical-align: top;
	/*width: 100%;*/
}

.title-meta {
	background: rgba(0, 0, 0, 0.5);
	padding: 15px;
	position: absolute;
	bottom: 0;
	left: 0;
}

.staff-grid-archive .content .entry-title,
.staff-profile .entry-title {
	margin-bottom: 4px;
	line-height: 1;
}

.staff-grid-archive .content .entry-title a,
.staff-profile .entry-title a {
	color: #fff;
}

.staff-grid-archive .content p.entry-meta,
.staff-profile p.entry-meta {
	color: #bbb;
	text-transform: none;
	font-size: 13px;
	margin-bottom: 0;
}

.staff-grid-archive .content p.entry-meta a,
.staff-profile p.entry-meta a {
	color: #fff;
}

.archive-pagination {
	clear: both;
}

.lightbox-content {
	padding: 20px;
	line-height: 1.4;
}

.previous-post-link {
	float: left;
}

.next-post-link {
	float: right;
}

.featured-content .one-half,
.featured-content .one-third,
.featured-content .one-fourth,
.featured-content .one-fifth,
.featured-content .one-sixth {
	width: 100%;
	float: none;
	margin: 0;
}

@media only screen and (max-width: 1023px) {

	.staff-grid-archive .content .entry-title,
	.staff-profile .entry-title {
		font-size: 25px;
	}

	.title-meta {
		padding: 10px;
	}

}

@media only screen and (max-width: 860px) {

	.staff-grid-archive .content .entry {
		width: 45%;
		margin-right: 40px;
	}

	.staff-grid-archive .content .entry:nth-of-type(2n) {
		margin-right: 0;
		clear: none;
	}

	.title-meta {
		position: static;
		background: transparent;
	}

	.staff-grid-archive .content .entry-title a, .staff-profile .entry-title a,
	.staff-grid-archive .content p.entry-meta a, .staff-profile p.entry-meta a {
		color: #333;
	}

	.staff-grid-archive .entry {
		margin-bottom: 30px;
	}

}

@media only screen and (max-width: 532px) {

	.staff-grid-archive .content .entry {
		width: 100%;
		margin-right: 0;
	}

}