Update maksimovic.md

_people/maksimovic.md

 ---
 firstname: Petar
-lastname: Maksimović
+lastname: Maksimovi\'{c}
 position: Research Fellow
 webpage: https://sites.google.com/site/petarmaksimovic1981/
 email: p.maksimovic@imperial.ac.uk
@@ -12,3 +12,6 @@ projects:
   - sl
 ---
 
+Petar is a Research Fellow with the group and the Academic Program Manager for the [Research Institute on Verified Trustworthy Software Systems (VeTSS)](https://vetss.org.uk/). 
+
+He also holds the position of Research Assistant Professor at the Mathematical Institute of the Serbian Academy of Sciences and Arts, Belgrade.
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