diff --git a/_data/authors.yml b/_data/authors.yml
index 61ae1ba7..fc57401c 100644
--- a/_data/authors.yml
+++ b/_data/authors.yml
@@ -175,10 +175,12 @@ Jakob Blomer:
 
 Jonas Hahnfeld:
   name        : "Jonas Hahnfeld"
-  bio         : "Jonas graduated with a M.Sc. in Computer Science from RWTH Aachen University
-                 and joined CERN as a Junior Fellow in November 2020. In the EP-SFT group, he
-                 works on GPU-related topics in ROOT and the simulation R&D subgroup."
-  short_bio   : "Jonas is working on GPU-related topics in ROOT."
+  bio         : "Jonas is a computer scientist and joined CERN as a Junior Fellow in 2020,
+                 working on Cling in the ROOT team. Since November 2023, he is a Gentner
+                 PhD student associated with the Goethe University Frankfurt. As part of
+                 his research, Jonas works on parallel writing of RNTuple data and
+                 concurrent histograms."
+  short_bio   : "Jonas is working on RNTuple and concurrent histograms."
   tag         : "team"
   affiliation : "CERN"
   avatar      : "/assets/images/JH.jpg"
diff --git a/_publications/2024-08-29-EuroPar-RNTuple.md b/_publications/2024-08-29-EuroPar-RNTuple.md
new file mode 100644
index 00000000..45869276
--- /dev/null
+++ b/_publications/2024-08-29-EuroPar-RNTuple.md
@@ -0,0 +1,9 @@
+---
+layout: default
+title: Parallel Writing of Nested Data in Columnar Formats
+authors: Jonas Hahnfeld, Jakob Blomer, Thorsten Kollegger
+conference: 30th European Conference on Parallel and Distributed Processing (Euro-Par 2024)
+type: IO
+doi: 10.1007/978-3-031-69766-1_2
+www: https://cds.cern.ch/record/2919226/
+---
diff --git a/assets/images/JH.jpg b/assets/images/JH.jpg
index d0ee47cd..40ae95b5 100644
Binary files a/assets/images/JH.jpg and b/assets/images/JH.jpg differ