diff --git a/_data/contributors.yml b/_data/contributors.yml
index f1533b1..ce789db 100644
--- a/_data/contributors.yml
+++ b/_data/contributors.yml
@@ -42,6 +42,12 @@
   email: apenev@uni-plovdiv.bg
   education: PhD Computer Science, University of Plovdiv "Paisii Hilendarski", Plovdiv, Bulgaria (2013)
   active: 1
+
+  
+
+ 
+ 
+
   associated: 1
   org: University of Plovdiv "Paisii Hilendarski"
   responsibilities: |
@@ -81,6 +87,7 @@
 #                                     TEAM                                     #
 ################################################################################
 
+
 - name: Aaron Jomy
   photo: Aaron.jpg
   info: "Research Intern at CERN"
@@ -315,6 +322,39 @@
       proposal: /assets/docs/petro_mozil_promosal_GSoC_2025.pdf
       mentors: Martin Vassilev, David Lange
 
+   
+- name: Galin Bistrev
+  photo: Bistrev.png
+  info: "CERN Summer student 2025"
+  email: gbistrev@uni-sofia.bg
+  education: "Nuclear and particle physics , Sofia University "St. Kliment  Ohridski , Bulgaria"
+  github: "https://github.com/GalinBistrev2"
+  active: 1
+  linkedin: "https://www.linkedin.com/in/galin-bistrev-905920369/"
+  projects:
+    - title: "Implementing AD in CMS Combine"
+      status: Ongoing
+      description: |
+        This project aims to introduce automatic differentiation techniques into the CMS Combine tool.
+        Combine is the primary statistical analysis tool used in CMS and is based on the RooFit software. 
+        Recently RooFit has started using automatic differentiation (AD) technology to aid minimization algorithms.
+        Computationally cheap gradients produced by AD can improve performance of the 
+        larger workflows in Combine by more than 5x as demonstrated at ICHEP.
+        The way how RooFit implements AD also benefits the shareability of likelihoods.
+        To get the likelihood gradient, RooFit transforms the likelihood from 
+        its internal representation to simple standalone C++ code, which is then used to generate the gradient code. 
+        This can help collaborators without RooFit and Combine expertise to work with likelihoods from Combine at a lower level. 
+        Adopting AD in Combine requires further collaboration between the parties.
+        This project aims to bring this AD support into Combine. 
+        Aspects include reducing some of the code in Combine in favor of more standard RooFit primitives; 
+        Implementing AD support for Combine-specific RooFit primitives; 
+        and writing benchmarks to showcase the benefits of RooFit AD in Combine. 
+        The student selected for this project will work with several 
+        high-energy physics codes as well as the LLVM compiler ecosystem.
+      mentors: Vasil Vassilev,David Lange,Jonas Rembser 
+ 
+
+
 - name: Jiayang Li
   photo: Jiayang_Li.jpg
   info: "Google Summer of Code 2025 Contributor"
@@ -338,6 +378,7 @@
       proposal: /assets/docs/Jiayang_Li_Proposal_2025.pdf
       mentors: Vassil Vassilev, Martin Vassilev
       
+
 - name: Salvador de la Torre Gonzalez
   photo: salva_de_la_torre_gonzalez.jpg
   info: "Google Summer of Code 2025 Contributor"
@@ -1481,3 +1522,4 @@
       report: |
         [Poster](/assets/presentations/LLVM2020_Clad.pdf){:target="_blank"}
       mentors: Vassil Vassilev, Alexander Penev   
+
diff --git a/images/team/Bistrev.png b/images/team/Bistrev.png
new file mode 100644
index 0000000..a252fc0
Binary files /dev/null and b/images/team/Bistrev.png differ