diff --git a/features/schema-markup/config.php b/features/schema-markup/config.php
index e69de29..e1b6df5 100644
--- a/features/schema-markup/config.php
+++ b/features/schema-markup/config.php
@@ -0,0 +1,21 @@
+<?php
+/**
+ * Feature name
+ *
+ * @var string
+ */
+$name = 'Schema Markup';
+
+/**
+ * Feature ID
+ *
+ * @var string
+ */
+$id = 'schema-markup';
+
+/**
+ * Feature description
+ *
+ * @var string
+ */
+$description = 'Automatically add JSON-LD Schema Markup to your site';
diff --git a/features/schema-markup/includes/class-wp-hooks.php b/features/schema-markup/includes/class-wp-hooks.php
new file mode 100644
index 0000000..0d063dc
--- /dev/null
+++ b/features/schema-markup/includes/class-wp-hooks.php
@@ -0,0 +1,388 @@
+<?php
+
+namespace SEOPlugin\Feature\Schema_Markup;
+
+class WP_Hooks {
+	/**
+	 * Object instance
+	 *
+	 * @var object
+	 */
+	static $instance;
+
+	/**
+	 * Config
+	 *
+	 * @var array associative array of feature config
+	 */
+	var $config = array();
+
+	/**
+	 * Constructor
+	 */
+	public function __construct() {
+		require __DIR__ . '/../config.php';
+		$this->config = compact( 'name', 'id', 'description' );
+
+		// add schema markup
+		add_action( 'wp_head', array( $this, 'add_schema' ), 1 );
+
+	}
+
+	/**
+	 * Create and return schema data for @type = WebSite
+	 *
+	 * @return array
+	 */
+	private function schema_website() {
+		$schema = array(
+			'@type'           => 'WebSite',
+			'@id'             => home_url( '#website' ),
+			'url'             => home_url(),
+			'name'            => get_bloginfo( 'name' ),
+			'description'     => get_bloginfo( 'description' ),
+			'potentialAction' =>
+			array(
+				array(
+					'@type'       => 'SearchAction',
+					'target'      => home_url( '?s={search_term_string}' ),
+					'query-input' => 'required name=search_term_string',
+				),
+			),
+			'inLanguage'      => get_locale(),
+		);
+		return $schema;
+	}
+
+	/**
+	 * Create and return schema data for @type = WebPage
+	 *
+	 * @return array
+	 */
+
+	/**
+	 * Create and return schema data for @type = WebPage
+	 *
+	 * @param  boolean $include_author True to include author property
+	 * @return array
+	 */
+	private function schema_webpage( $include_author = false ) {
+		$permalink = get_permalink();
+		$schema    = array(
+			'@type'           => 'WebPage',
+			'@id'             => $permalink . '#webpage',
+			'url'             => $permalink,
+			'name'            => wp_title( '&raquo;', false ),
+			'isPartOf'        =>
+			array(
+				'@id' => home_url( '#website' ),
+			),
+			'datePublished'   => get_the_date( \DateTime::ATOM ),
+			'dateModified'    => get_the_modified_date( \DateTime::ATOM ),
+			'inLanguage'      => get_locale(),
+			'author'          => array(
+				'@id' => $this->get_person_id( get_the_author() ),
+			),
+			'potentialAction' =>
+			array(
+				array(
+					'@type'  => 'ReadAction',
+					'target' =>
+					array(
+						$permalink,
+					),
+				),
+			),
+		);
+		if ( ! $include_author ) {
+			unset( $schema['author'] );
+		}
+		return $schema;
+	}
+
+	/**
+	 * Create and return schema data for @type = Person
+	 *
+	 * @param  string $person (Optional) Current author if not specified
+	 * @return array
+	 */
+	private function schema_person( $person = null ) {
+		static $gravatars = array();
+		if ( empty( $person ) ) {
+			$person = get_the_author();
+		}
+		if ( empty( $person ) ) {
+			return array();
+		}
+		if ( empty( $gravatars[ $person ] ) ) {
+			$gravatars[ $person ] = sprintf( '//0.gravatar.com/avatar/%s?s=96&d=mm&r=g', md5( strtolower( trim( get_the_author_meta( 'user_email' ) ) ) ) );
+		}
+		$name   = $this->get_person_name();
+		$schema = array(
+			'@type'  => 'Person',
+			'@id'    => $this->get_person_id( $person ),
+			'name'   => $name,
+			'image'  =>
+			array(
+				'@type'      => 'ImageObject',
+				'@id'        => home_url( '#personlogo' ),
+				'inLanguage' => get_locale(),
+				'url'        => $gravatars[ $person ],
+				'caption'    => $name,
+			),
+			'sameAs' =>
+			array(
+				home_url(),
+			),
+		);
+		return $schema;
+	}
+
+	/**
+	 * Create and return the @id to be used for @type = Person
+	 *
+	 * @param  string $person (Optional) Current author if not specified
+	 * @return string
+	 */
+	private function get_person_id( $person = null ) {
+		if ( empty( $person ) ) {
+			$person = get_the_author();
+		}
+		if ( empty( $person ) ) {
+			return '';
+		}
+		return home_url( '#/schema/person/' . md5( $person ) );
+	}
+
+	/**
+	 * Create and return the name of a person
+	 *
+	 * @param  boolean $user_id (Optional) Current author if not specified
+	 * @return string
+	 */
+	private function get_person_name( $user_id = false ) {
+		return get_the_author_meta( 'display_name', $user_id ) ?: get_the_author_meta( 'first_name', $user_id ) . ' ' . get_the_author_meta( 'last_name', $user_id );
+	}
+
+	/**
+	 * Create and return schema data for @type = ProfilePage
+	 *
+	 * @return array
+	 */
+	private function schema_profile_page() {
+		$id     = get_the_author_meta( 'ID' );
+		$url    = get_author_posts_url( $id );
+		$schema = array(
+			'@type'           => 'ProfilePage',
+			'@id'             => $url . '#webpage',
+			'url'             => $url,
+			'name'            => $this->get_person_name( $id ) . ', Author at ' . get_bloginfo( 'name' ),
+			'isPartOf'        =>
+			array(
+				'@id' => home_url( '#website' ),
+			),
+			'inLanguage'      => get_locale(),
+			'potentialAction' =>
+			array(
+				array(
+					'@type'  => 'ReadAction',
+					'target' =>
+					array(
+						$url,
+					),
+				),
+			),
+		);
+		return $schema;
+	}
+
+	/**
+	 * Inserts schema to header
+	 *
+	 * @wp-hook wp_head
+	 */
+	public function add_schema() {
+		$schema = array();
+		switch ( true ) {
+			case is_home():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						array(
+							'@type'           => 'CollectionPage',
+							'@id'             => 'http://seoplugin.local/#webpage',
+							'url'             => home_url(),
+							'name'            => 'SEO Plugin - Just another WordPress site',
+							'isPartOf'        =>
+							array(
+								'@id' => home_url( '#website' ),
+							),
+							'description'     => get_bloginfo( 'description' ),
+							'inLanguage'      => get_locale(),
+							'potentialAction' =>
+							array(
+								array(
+									'@type'  => 'ReadAction',
+									'target' =>
+									array(
+										home_url(),
+									),
+								),
+							),
+						),
+					),
+				);
+
+				break;
+			case is_page():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						$this->schema_webpage(),
+					),
+				);
+				break;
+			case is_single():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						$this->schema_webpage(),
+						$this->schema_person(),
+					),
+				);
+				break;
+			case is_attachment():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						array(
+							'@type'           => 'WebPage',
+							'@id'             => 'http://seoplugin.local/sample-page/#webpage',
+							'url'             => 'http://seoplugin.local/sample-page/',
+							'name'            => 'Sample Page - SEO Plugin',
+							'isPartOf'        =>
+							array(
+								'@id' => home_url( '#website' ),
+							),
+							'datePublished'   => '2021-01-10T14:09:27+00:00',
+							'dateModified'    => '2021-01-21T05:06:08+00:00',
+							'inLanguage'      => get_locale(),
+							'potentialAction' =>
+							array(
+								array(
+									'@type'  => 'ReadAction',
+									'target' =>
+									array(
+										'http://seoplugin.local/sample-page/',
+									),
+								),
+							),
+						),
+					),
+				);
+				break;
+			case is_category():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						array(
+							'@type'           => 'WebPage',
+							'@id'             => 'http://seoplugin.local/sample-page/#webpage',
+							'url'             => 'http://seoplugin.local/sample-page/',
+							'name'            => 'Sample Page - SEO Plugin',
+							'isPartOf'        =>
+							array(
+								'@id' => home_url( '#website' ),
+							),
+							'datePublished'   => '2021-01-10T14:09:27+00:00',
+							'dateModified'    => '2021-01-21T05:06:08+00:00',
+							'inLanguage'      => get_locale(),
+							'potentialAction' =>
+							array(
+								array(
+									'@type'  => 'ReadAction',
+									'target' =>
+									array(
+										'http://seoplugin.local/sample-page/',
+									),
+								),
+							),
+						),
+					),
+				);
+				break;
+			case is_tag():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						array(
+							'@type'           => 'CollectionPage',
+							'@id'             => 'http://seoplugin.local/tag/lopez/#webpage',
+							'url'             => 'http://seoplugin.local/tag/lopez/',
+							'name'            => 'lopez Archives - SEO Plugin',
+							'isPartOf'        =>
+							array(
+								'@id' => home_url( '#website' ),
+							),
+							'inLanguage'      => get_locale(),
+							'potentialAction' =>
+							array(
+								array(
+									'@type'  => 'ReadAction',
+									'target' =>
+									array(
+										'http://seoplugin.local/tag/lopez/',
+									),
+								),
+							),
+						),
+					),
+				);
+				break;
+			case is_author():
+				$schema = array(
+					'@context' => 'https://schema.org',
+					'@graph'   =>
+					array(
+						$this->schema_website(),
+						$x = $this->schema_profile_page(),
+						$this->schema_person() + array(
+							'mainEntityOfPage' =>
+							array(
+								'@id' => $x['@id'],
+							),
+						),
+					),
+				);
+				break;
+		}
+		if ( $schema ) {
+			printf( '<script type="application/ld+json" class="seoplugin-schema-graph">%s</script>', json_encode( $schema, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT ) );
+		}
+	}
+
+
+	/**
+	 * Return object instance
+	 *
+	 * @return object
+	 */
+	static function instance() {
+		if ( empty( self::$instance ) ) {
+			self::$instance = new WP_Hooks();
+		}
+	}
+
+}
diff --git a/features/schema-markup/main.php b/features/schema-markup/main.php
index e69de29..6d5a4ef 100644
--- a/features/schema-markup/main.php
+++ b/features/schema-markup/main.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace SEOPlugin\Feature;
+
+Schema_Markup\WP_Hooks::instance();