Add Author Info Box below WordPress posts using functions.php

gistfile1.txt

function rvc_author_info_box( $content ) {
global $post;

// Detect if it is a single post with a post author
if ( is_single() && isset( $post->post_author ) ) {

// Get author's display name 
$display_name = get_the_author_meta( 'display_name', $post->post_author );

// If display name is not available then use nickname as display name
if ( empty( $display_name ) )
$display_name = get_the_author_meta( 'nickname', $post->post_author );
$author_details = '<p class="author_info">The author, <i>' . $display_name . '</i>, is a member of <i>Southern Nevada Collaborative Divorce Professionals</i> which is an association of lawyers, mental health professionals, and financial professionals specializing in the collaborative divorce process. If you have questions about collaborative divorce , please contact ' . $display_name . '. Contact information can be found by clicking/tapping the author image or the "View Profile" link on this page. </p>';

// Pass all this info to post content  
$content = $content . '<footer class="author_bio_section" >' . $author_details . '</footer>';
}
return $content;
}

// Add our function to the post content filter 
add_action( 'the_content', 'rvc_author_info_box' );

// Allow HTML in author info section
remove_filter('pre_user_description', 'wp_filter_kses');