diff --git a/_data/people.yml b/_data/people.yml
index ab3203e..cd32264 100644
--- a/_data/people.yml
+++ b/_data/people.yml
@@ -34,8 +34,10 @@ phd:
     webpage: "https://en.uit.no/ansatte/person?p_document_id=767125&p_dimension_id=88140"
 
   - name: "Jonas Berg Hansen"
+    image: "/figs/people/jbh.jpg"
     bio: "Jonas is a PhD student researching pooling in graph neural networks. He applies his research in the context of energy analytics."
     webpage: "https://en.uit.no/ansatte/person?p_document_id=686752&p_dimension_id=88131"
+    github: "https://github.com/JonasBergHansen"
 
 postdoc:
   - name: "Andrea Cini"
@@ -84,3 +86,12 @@ collaborator:
     scholar: "https://scholar.google.com/citations?user=s6gZ2LAAAAAJ&hl=it"
     github: "https://github.com/carloabate"
     linkedin: "https://www.linkedin.com/in/carloabate/"
+
+  - name: "Daniele Castellana"
+    image: "/figs/people/dc.png"
+    position: "Assistant Professor"
+    affiliation: "University of Florence"
+    scholar: "https://scholar.google.it/citations?user=Dzv0TCAAAAAJ&hl=en"
+    webpage: "https://danielecastellana22.github.io/"
+    github: "https://github.com/danielecastellana22"
+    linkedin: "https://www.linkedin.com/in/daniele-castellana/"
diff --git a/_site/feed.xml b/_site/feed.xml
index 45fb3f5..5c3e0b2 100644
--- a/_site/feed.xml
+++ b/_site/feed.xml
@@ -1,2 +1,2 @@
-<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="4.3.4">Jekyll</generator><link href="http://localhost:4000/feed.xml" rel="self" type="application/atom+xml" /><link href="http://localhost:4000/" rel="alternate" type="text/html" /><updated>2024-10-22T13:36:58+02:00</updated><id>http://localhost:4000/feed.xml</id><title type="html">Northernmost GraphML Group</title><subtitle>The Northermost GraphML group in the world, based in Tromsø, Norway.
+<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" ><generator uri="https://jekyllrb.com/" version="4.3.4">Jekyll</generator><link href="http://localhost:4000/feed.xml" rel="self" type="application/atom+xml" /><link href="http://localhost:4000/" rel="alternate" type="text/html" /><updated>2024-10-22T13:51:14+02:00</updated><id>http://localhost:4000/feed.xml</id><title type="html">Northernmost GraphML Group</title><subtitle>The Northermost GraphML group in the world, based in Tromsø, Norway.
 </subtitle></feed>
\ No newline at end of file
diff --git a/_site/figs/people/dc.png b/_site/figs/people/dc.png
new file mode 100644
index 0000000..99aa32e
Binary files /dev/null and b/_site/figs/people/dc.png differ
diff --git a/_site/figs/people/jbh.jpg b/_site/figs/people/jbh.jpg
new file mode 100644
index 0000000..5e374a6
Binary files /dev/null and b/_site/figs/people/jbh.jpg differ
diff --git a/_site/people.html b/_site/people.html
index 17c705a..1bc4f9a 100644
--- a/_site/people.html
+++ b/_site/people.html
@@ -241,7 +241,7 @@ <h3>Michele Guerra</h3>
             </div>
             
             <div class="person">
-                <img src="/figs/people/default.png" alt="Jonas Berg Hansen's profile picture" class="profile-pic" />
+                <img src="/figs/people/jbh.jpg" alt="Jonas Berg Hansen's profile picture" class="profile-pic" />
                 <div class="info">
                     <h3>Jonas Berg Hansen</h3>
                     <p>Jonas is a PhD student researching pooling in graph neural networks. He applies his research in the context of energy analytics.</p>
@@ -256,6 +256,10 @@ <h3>Jonas Berg Hansen</h3>
                         
                         
                         
+                        <a href="https://github.com/JonasBergHansen" target="_blank" title="GitHub">
+                            <i class="fab fa-github"></i>
+                        </a>
+                        
                     </div>
                 </div>
             </div>
@@ -420,6 +424,43 @@ <h3>Carlo Abate</h3>
                 </div>
             </div>
             
+            <div class="collaborator">
+                <!-- Image (optional) -->
+                <img src="/figs/people/dc.png" alt="Daniele Castellana's profile picture" class="profile-pic" />
+
+                <!-- Information -->
+                <div class="info">
+                    <h3>Daniele Castellana</h3>
+                    <p>Assistant Professor</p>
+                    <p>University of Florence</p>
+
+                    <div class="links">
+                        
+                        <a href="https://danielecastellana22.github.io/" target="_blank" title="Personal Webpage">
+                            <i class="fas fa-globe"></i>
+                        </a>
+                        
+                        
+                        
+                        <a href="https://scholar.google.it/citations?user=Dzv0TCAAAAAJ&hl=en" target="_blank" title="Google Scholar">
+                            <i class="fas fa-graduation-cap"></i>
+                        </a>
+                        
+                        
+                        
+                        <a href="https://www.linkedin.com/in/daniele-castellana/" target="_blank" title="LinkedIn">
+                            <i class="fab fa-linkedin"></i>
+                        </a>
+                        
+                        
+                        <a href="https://github.com/danielecastellana22" target="_blank" title="GitHub">
+                            <i class="fab fa-github"></i>
+                        </a>
+                        
+                    </div>
+                </div>
+            </div>
+            
         </div>
     </section>
 </div>
diff --git a/_site/theses/gnn-physics/index.html b/_site/theses/gnn-physics/index.html
index 8fcb7ae..75b31f2 100644
--- a/_site/theses/gnn-physics/index.html
+++ b/_site/theses/gnn-physics/index.html
@@ -19,11 +19,11 @@
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-<meta property="article:published_time" content="2024-10-22T13:36:58+02:00" />
+<meta property="article:published_time" content="2024-10-22T13:51:14+02:00" />
 <meta name="twitter:card" content="summary" />
 <meta property="twitter:title" content="Graph neural networks and Physics" />
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+{"@context":"https://schema.org","@type":"BlogPosting","dateModified":"2024-10-22T13:51:14+02:00","datePublished":"2024-10-22T13:51:14+02:00","description":"Graph neural networks and Physics","headline":"Graph neural networks and Physics","mainEntityOfPage":{"@type":"WebPage","@id":"http://localhost:4000/theses/gnn-physics/"},"publisher":{"@type":"Organization","logo":{"@type":"ImageObject","url":"http://localhost:4000/figs/NGMLGlogo2.png"}},"url":"http://localhost:4000/theses/gnn-physics/"}</script>
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diff --git a/_site/theses/graph-pooling/index.html b/_site/theses/graph-pooling/index.html
index 06834b9..07a10a2 100644
--- a/_site/theses/graph-pooling/index.html
+++ b/_site/theses/graph-pooling/index.html
@@ -19,11 +19,11 @@
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+<meta property="article:published_time" content="2024-10-22T13:51:14+02:00" />
 <meta name="twitter:card" content="summary" />
 <meta property="twitter:title" content="Clustering and graph coarsening with Graph Neural Networks" />
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+{"@context":"https://schema.org","@type":"BlogPosting","dateModified":"2024-10-22T13:51:14+02:00","datePublished":"2024-10-22T13:51:14+02:00","description":"Clustering and graph coarsening with Graph Neural Networks","headline":"Clustering and graph coarsening with Graph Neural Networks","mainEntityOfPage":{"@type":"WebPage","@id":"http://localhost:4000/theses/graph-pooling/"},"publisher":{"@type":"Organization","logo":{"@type":"ImageObject","url":"http://localhost:4000/figs/NGMLGlogo2.png"}},"url":"http://localhost:4000/theses/graph-pooling/"}</script>
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diff --git a/_site/theses/polar-weather/index.html b/_site/theses/polar-weather/index.html
index 0a28ca4..87423fe 100644
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+<meta property="article:published_time" content="2024-10-22T13:51:14+02:00" />
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 <meta property="twitter:title" content="Polar weather prediction with Graph neural networks" />
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+{"@context":"https://schema.org","@type":"BlogPosting","dateModified":"2024-10-22T13:51:14+02:00","datePublished":"2024-10-22T13:51:14+02:00","description":"Polar weather prediction with Graph neural networks","headline":"Polar weather prediction with Graph neural networks","mainEntityOfPage":{"@type":"WebPage","@id":"http://localhost:4000/theses/polar-weather/"},"publisher":{"@type":"Organization","logo":{"@type":"ImageObject","url":"http://localhost:4000/figs/NGMLGlogo2.png"}},"url":"http://localhost:4000/theses/polar-weather/"}</script>
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diff --git a/_site/theses/power-flow/index.html b/_site/theses/power-flow/index.html
index 83a9389..e703990 100644
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+<meta property="article:published_time" content="2024-10-22T13:51:14+02:00" />
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 <meta property="twitter:title" content="Power flow optimization with Graph Neural Networks" />
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+{"@context":"https://schema.org","@type":"BlogPosting","dateModified":"2024-10-22T13:51:14+02:00","datePublished":"2024-10-22T13:51:14+02:00","description":"Power flow optimization with Graph Neural Networks","headline":"Power flow optimization with Graph Neural Networks","mainEntityOfPage":{"@type":"WebPage","@id":"http://localhost:4000/theses/power-flow/"},"publisher":{"@type":"Organization","logo":{"@type":"ImageObject","url":"http://localhost:4000/figs/NGMLGlogo2.png"}},"url":"http://localhost:4000/theses/power-flow/"}</script>
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diff --git a/_site/theses/text-data/index.html b/_site/theses/text-data/index.html
index 2b929a6..374d497 100644
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+<meta property="article:published_time" content="2024-10-22T13:51:14+02:00" />
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 <meta property="twitter:title" content="Graph of text data, using large language models" />
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diff --git a/figs/people/dc.png b/figs/people/dc.png
new file mode 100644
index 0000000..99aa32e
Binary files /dev/null and b/figs/people/dc.png differ
diff --git a/figs/people/jbh.jpg b/figs/people/jbh.jpg
new file mode 100644
index 0000000..5e374a6
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