diff --git a/README.md b/README.md
index ddcd9a0..06bb529 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ The SEO tag will respect any of the following if included in your site's `_confi
 * `social` - For [specifying social profiles](https://developers.google.com/structured-data/customize/social-profiles). The following properties are available:
   * `name` - If the user or organization name differs from the site's name
   * `links` - An array of links to social media profiles.
+  * `date_modified` - Manually specify the `dateModified` field in the JSON-LD output to override Jekyll's own `dateModified`. This field will take **first priority** for the `dateModified` JSON-LD output. This is useful when the file timestamp does not match the true time that the content was modified. A user may also install [Last Modified At](https://github.com/gjtorikian/jekyll-last-modified-at) which will offer an alternative way of providing for the `dateModified` field.
 
   ```yml
   social:
diff --git a/lib/template.html b/lib/template.html
index c06665c..e3375c2 100755
--- a/lib/template.html
+++ b/lib/template.html
@@ -65,6 +65,10 @@
   {% assign seo_author_twitter = seo_author_twitter | replace:"@","" %}
 {% endif %}
 
+{% if page.date_modified or page.last_modified_at or page.date %}
+  {% assign seo_date_modified = page.seo.date_modified | default: page.last_modified_at %}
+{% endif %}
+
 {% if page.seo and page.seo.type %}
     {% assign seo_type = page.seo.type %}
 {% elsif seo_homepage_or_about %}
@@ -211,6 +215,13 @@
     "headline": {{ seo_page_title | jsonify }},
 {% endif %}
 
+{% if seo_author %}
+    "author": {
+       "@type": "Person",
+       "name": {{ seo_author | jsonify }}
+    },
+{% endif %}
+
 {% if seo_page_image %}
     "image": {{ seo_page_image | jsonify }},
 {% endif %}
@@ -219,6 +230,10 @@
     "datePublished": {{ page.date | date_to_xmlschema | jsonify }},
 {% endif %}
 
+{% if seo_date_modified %}
+    "dateModified": {{ seo_date_modified | date_to_xmlschema | jsonify }},
+{% endif %}
+
 {% if seo_description %}
     "description": {{ seo_description | jsonify }},
 {% endif %}
@@ -226,6 +241,9 @@
 {% if seo_site_logo %}
     "publisher": {
         "@type": "Organization",
+        {% if seo_author %}
+            "name": {{ seo_author | jsonify }},
+        {% endif %}
         "logo": {
             "@type": "ImageObject",
             "url": {{ seo_site_logo | jsonify }}
@@ -233,6 +251,13 @@
     },
 {% endif %}
 
+{% if seo_type == "BlogPosting" or seo_type == "CreativeWork"%}
+    "mainEntityOfPage": {
+        "@type": "WebPage",
+        "@id": {{ page.url | replace:'/index.html','/' | absolute_url | jsonify }}
+    },
+{% endif %}
+
 {% if seo_links %}
     "sameAs": {{ seo_links | jsonify }},
 {% endif %}
diff --git a/spec/jekyll_seo_tag_spec.rb b/spec/jekyll_seo_tag_spec.rb
index 47ca794..546c2c2 100755
--- a/spec/jekyll_seo_tag_spec.rb
+++ b/spec/jekyll_seo_tag_spec.rb
@@ -244,6 +244,48 @@ describe Jekyll::SeoTag do
       end
     end
 
+    context "with site.logo and page.author" do
+      let(:site) { make_site("logo" => "http://cdn.example.invalid/logo.png", "url" => "http://example.invalid", "author" => "Mr. Foo") }
+
+      it "outputs the author" do
+        expect(json_data["publisher"]["name"]).to eql("Mr. Foo")
+      end
+    end
+
+    context "with page author" do
+      let(:site) { make_site("logo" => "/logo.png", "url" => "http://example.invalid") }
+      let(:page) { make_post("author" => "Mr. Foo") }
+
+      it "outputs the author" do
+        expect(json_data["author"]["@type"]).to eql("Person")
+        expect(json_data["author"]["name"]).to eql("Mr. Foo")
+      end
+
+      it "outputs the publisher author" do
+        expect(json_data["publisher"]["name"]).to eql("Mr. Foo")
+      end
+    end
+
+    context "with seo type is BlogPosting" do
+      let(:site) { make_site("url" => "http://example.invalid") }
+      let(:page) { make_post("seo" => { "type" => "BlogPosting" }, "permalink" => "/foo/") }
+
+      it "outputs the mainEntityOfPage" do
+        expect(json_data["mainEntityOfPage"]["@type"]).to eql("WebPage")
+        expect(json_data["mainEntityOfPage"]["@id"]).to eql("http://example.invalid/foo/")
+      end
+    end
+
+    context "with seo type is CreativeWork" do
+      let(:site) { make_site("url" => "http://example.invalid") }
+      let(:page) { make_post("seo" => { "type" => "CreativeWork" }, "permalink" => "/foo/") }
+
+      it "outputs the mainEntityOfPage" do
+        expect(json_data["mainEntityOfPage"]["@type"]).to eql("WebPage")
+        expect(json_data["mainEntityOfPage"]["@id"]).to eql("http://example.invalid/foo/")
+      end
+    end
+
     context "with site.title" do
       let(:site) { make_site("title" => "Foo", "url" => "http://example.invalid") }