It was my privilege to meet Stefan just a few weeks ago when I joined the GS-Foundation where he last worked as the COO. Even in this brief time, he made a lasting impression as a kind-hearted individual, a dedicated peacemaker, and a proud father. Stefan’s warmth, leadership, and presence created an atmosphere of inclusivity and inspiration. Beyond his remarkable professional achievements, he was a deeply thoughtful and philosophical soul, reflecting profoundly on the interconnectedness of all living beings. His wisdom and kindness will be greatly missed.

Stefan was a man full of vision and desire to make the world a better place. Sadly, he left us far too soon. We mourn not only the loss of our colleague, but more importantly, the loss of a friend that we have grown to care about over the past year. We hope that we were able to brighten your last year with a few moments of joy. You certainly gave us moments of joy, admiration and drive. Your positive nature and kind heart have changed us and we will never forget you.

I too feel very privileged, honored, and thankful to have met Stefan. It was about two decades ago that I met him in Kosovo. I was immediately stunned by his openness, fairmindedness, knowledge, dedication, and hard work, which had a lasting impact on myself. In my opinion it is rare to meet a person like Stefan. He was truly an outstanding individual. I am sure that his legacy will live on and continue to inspire many people. I am sending my condolences and very best wishes to his family and friends.

I had the privilege to know and work together with Stefan for more than 20 years. Starting with Kosovo and Bosnia, later with the UN, UNITAR and the GS-FOUNDATION. Stefan was a role model with a vision, to make this world a better place. We will never forget you. Rest in peace my friend! My deepest condolences to the family!

With Stefan Feller, I have lost a constant companion and a true friend. Stefan was not just a colleague or mentor to me—he was someone who shaped my path and inspired me in countless ways. Whether in the Foreign Office, in Afghanistan, or beyond, Stefan was always there, with his vision, strategic mind, and his deep humanity. He brought not only unmatched expertise and dedication to his work but also a kindness and warmth that made every challenge seem more manageable. His presence lit up every room, every meeting, and every project we worked on together. Stefan, you were always more than just a professional companion—you were a true friend. I learned so much from you—your wisdom, your integrity, and your belief in the power of humanity. What you taught me will live on in me, shaping the way I approach life and work. I miss you deeply, and my heart aches knowing you are no longer with us. My deepest condolences go out to his family and all who had the privilege of knowing him. Your legacy, Stefan, will live on in our memories, our work, and the values you taught us to hold dear. I will never forget you.

I have had the honor and privilege to meet and work with Stefan on several occasions during the last few years. Stefan was an honest, committed, super motivated and hard working professional and for many an example. You will be truly missed! My condolences to the family and friends for this huge loss.

It was with a great regret that I hearded oft he sudden death of Stefan Feller. Even though I only had a short time the opportunity to get to know Stefan Feller briefly as COO of the GS-Foundation as part of the trinational police project Germany/Chile/Colombia, he impressed me with his international expertise, his competence and his human approach. My deepest compassion goes to his familiy, his friends and to all the colleagues who had the privilege of working with him.

with great sorrow we at the GPU learned about Stefans sudden death. I`ve known him since the beginning of my professional career and we met on several occasions during many years and in different countries. He contributed to a very large extend to the benefit of peace and people. For a short term he was also a well received expert member of our University and lectured here. I've rarely seen a more task- dedicated and motivated person. We and I will miss him and his always good mood and smile very much indeed. Rest in peace dear Stefan.

I was very saddened to learn about Stefan's untimely departure. I had the pleasure to work with him during his assignment with the United Nations in Kosovo, and then during his tenure as Police Adviser in New York. He always demonstrated an outstanding level of leadership, professionalism, dedication and courage. He was always available to discuss and demonstrated a thorough commitment to the values of the United Nations. I would like to express to his family and friends my deepest condolences in these challenging circumstances.