diff --git a/docs/.authors.yml b/docs/.authors.yml
index a3e6f27..fdc499d 100644
--- a/docs/.authors.yml
+++ b/docs/.authors.yml
@@ -1,6 +1,12 @@
 authors:
   ptuemmler:
     name: Paul Tuemmler        # Author name
-    description: Strong-field nanophysics # Author description
-    avatar: https://github.com/ptuemmler.png
-    url: https://github.com/ptuemmler
\ No newline at end of file
+    description: Strong-Field Nanophysics # Author description
+    avatar: https://www.snp.physik.uni-rostock.de/storages/uni-rostock/Alle_MNF/Physik_Starkfeld/pictures/team/paul_tuemmler.png
+    url: https://github.com/ptuemmler
+  lseiffert:
+    name: Lennart Seiffert        # Author name
+    description: Strong-Field Nanophysics # Author description
+    avatar: https://www.snp.physik.uni-rostock.de/storages/uni-rostock/Alle_MNF/Physik_Starkfeld/pictures/team/lennart_seiffert.png
+    url: https://github.com/LennartSeiffert
+    
diff --git a/docs/apps/MinkowskiSpaceTime/app.md b/docs/apps/MinkowskiSpaceTime/app.md
index ed3785a..2ecffbe 100644
--- a/docs/apps/MinkowskiSpaceTime/app.md
+++ b/docs/apps/MinkowskiSpaceTime/app.md
@@ -1,6 +1,7 @@
 ---
 authors:
   - ptuemmler
+  - lseiffert
 categories:
   - Physics
 tags: