Source code for https://victorfont.com/author-box-title-customization-in-genesis/

custom_author_box_title.php

<?php

/* Customize the author box title
add_filter( 'genesis_author_box_title', 'custom_author_box_title' );
function custom_author_box_title() {
	return 'About the Author';
}

vmf_custom_author_box_title.php

<?php

//* Customize the author box title
add_filter( 'genesis_author_box_title', 'vmf_custom_author_box_title' );
function vmf_custom_author_box_title() {
	if ( is_single() ) {
		$author = get_the_author();
		$author_link  = '' . $author . '';
		return 'About ' . $author_link . '';
	} else {
		$author = get_the_author();
		return 'About ' . $author . '';
	}
}