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// Add author box to single posts and author archives
add_filter( 'get_the_author_genesis_author_box_single', '__return_true' );
add_filter( 'get_the_author_genesis_author_box_archive', '__return_true' );
// And remove it from anything that's not a post
add_action ('genesis_entry_footer', 'wpm_remove_author_box' );
function wpm_remove_author_box() {
  if ( get_post_type() != 'post' ) {
    remove_action( 'genesis_after_entry', 'genesis_do_author_box_single', 8 );
  }
}