diff --git a/markdown_parser.py b/markdown_parser.py
index 18a15be..6bf6421 100644
--- a/markdown_parser.py
+++ b/markdown_parser.py
@@ -161,14 +161,58 @@ def extract_wordpress_metadata(frontmatter: Dict[str, Any],
     if 'author' not in metadata:
         metadata['author'] = default_author
     
-    # Autor als Tag hinzufügen (Format: Vorname_Nachname)
-    if metadata.get('author'):
-        author_tag = format_author_as_tag(metadata['author'])
-        # Füge Autor-Tag zu den Tags hinzu, falls noch nicht vorhanden
-        if author_tag and author_tag not in metadata.get('tags', []):
-            if 'tags' not in metadata:
-                metadata['tags'] = []
-            metadata['tags'].append(author_tag)
+    # Alle Autoren als Tags hinzufügen (Format: Vorname_Nachname)
+    # Sammle alle Autoren aus verschiedenen Quellen
+    all_authors = []
+    
+    # Aus direktem author-Feld
+    if 'author' in frontmatter:
+        author = frontmatter['author']
+        if isinstance(author, list):
+            all_authors.extend(author)
+        elif isinstance(author, str):
+            all_authors.append(author)
+    
+    # Aus #staticSiteGenerator
+    if isinstance(frontmatter.get('#staticSiteGenerator'), dict):
+        static_gen = frontmatter['#staticSiteGenerator']
+        if 'author' in static_gen:
+            author = static_gen['author']
+            if isinstance(author, list):
+                all_authors.extend(author)
+            elif isinstance(author, str):
+                all_authors.append(author)
+    
+    # Aus #commonMetadata.creator
+    if isinstance(frontmatter.get('#commonMetadata'), dict):
+        common = frontmatter['#commonMetadata']
+        if 'creator' in common:
+            creator = common['creator']
+            if isinstance(creator, list):
+                for c in creator:
+                    if isinstance(c, dict):
+                        given = c.get('givenName', '')
+                        family = c.get('familyName', '')
+                        full_name = f"{given} {family}".strip()
+                        if full_name:
+                            all_authors.append(full_name)
+            elif isinstance(creator, dict):
+                given = creator.get('givenName', '')
+                family = creator.get('familyName', '')
+                full_name = f"{given} {family}".strip()
+                if full_name:
+                    all_authors.append(full_name)
+    
+    # Duplikate entfernen und als Tags hinzufügen
+    seen_authors = set()
+    for author_name in all_authors:
+        if author_name and author_name not in seen_authors:
+            seen_authors.add(author_name)
+            author_tag = format_author_as_tag(author_name)
+            if author_tag and author_tag not in metadata.get('tags', []):
+                if 'tags' not in metadata:
+                    metadata['tags'] = []
+                metadata['tags'].append(author_tag)
     
     # Status extrahieren (falls vorhanden)
     if 'status' in frontmatter: