Philipp Wiesner
I’m a postdoctoral researcher at TU Berlin in the Distributed and Operating Systems (DOS) group led by Prof. Odej Kao, where I finished my PhD on carbon-aware computing in June 2025. I’m currently a visiting researcher at the Cambridge Sustainable Computing Lab.
My research focuses on making the environmental impact of large-scale AI systems transparent, accountable, and actionable. I’m broadly interested in research at the intersection of computing and energy systems, sustainable computing, systems for ML / ML for systems, and distributed systems.
Find me on Google Scholar , GitHub , and LinkedIn or contact me at wiesner at tu-berlin.de
- February 2026: Over the next four months, I will be visiting Loïc Lannelongue at the Cambridge Sustainable Computing Lab to work on energy and carbon accounting in computing.
- January 2026: We released version 0.13.0 of Vessim, our energy system simulator for datacenters, focusing on usability and introducing a new, comprehensive documentation written from the ground up.
- Dezember 2025: We will present or position paper Efficiency Will Not Lead to Sustainable Reasoning AI at EurIPS'25 in the workshop on Rethinking AI.
- November 2025: On Nov 14, we (exalsius) organize the first [Cold Start:] Distributed AI Hack Berlin togther with Flower, with a total price pool of €5000. Open to all, sign up!
- October 2025: I’m joining the AI + Environment Summit Zurich on the panel “The impact of AI on the environment and beyond”.
more ...
- September 2025: I was selected as one of 200 young researchers to participate in the 12th Heidelberg Laureate Forum.
- July 2025: Very happy to join the Technical Program Committee for ACM e-Energy'26.
- June 2025: I successfully defended my PhD thesis on Leveraging Temporal Flexibility in Carbon-Aware Optimization with summa cum laude.
- April 2025: Three accepted papers in one week! At ACM e-Energy'25, the CarbonMetrics'25 workshop at ACM SIGMETRICS, and the LOCO'24 post-proceedings. Pre-prints follow soon.
- December 2024: We’re organizing the 1st International Workshop on Low Carbon Computing (LOCO'24) on December 3 in Glasgow and online.
- October 2024: I’ll present our latest research on the trade-off between carbon footprint and user experience of ML inference at his month’s BIFOLD Lunch Talk.
- September 2024: Our paper Federated Learning over Connected Modes was accepted at NeurIPS'24.
- July 2024: My Software Campus project SYNERGY is coming to an end after 2.5 years. I’ve been leading a research team on sustaibale federated learning (FedZero, e-Energy'24) and the testing of carbon-aware systems (Vessim, HotCarbon'24).
- June 2024: Our paper Vessim: A Testbed for Carbon-Aware Applications and Systems has been accepted at HotCarbon'24.
- April 2024: The recording of my latest talk on carbon-efficient federated learning at the Flower Monthly April is now online.
- March 2024: Check out our new blog article on sustainable FL and my poster presentation at the Flower AI Summit 2024.
- Januar 2024: I am visiting Prof César De Rose at PUCRS in Porto Alegre, Brasil for a 6 week research stay.
- November 2023: Our paper FedZero: Leveraging Renewable Excess Energy in Federated Learning was accepted as a full paper at ACM e-Energy'24 which had an 8% acceptance rate (4/47) at their fall deadline.
- September 2023: Dennis Grinwald and I will be giving a talk on efficient ML at the 2nd BIFOLD Weizenbaum summer school.
- August 2023: Our paper Software-in-the-Loop Simulation for Developing and Testing Carbon-Aware Applications was accepted for publication in Software: Practice and Experience.
- July 2023: We released Vessim in GitHub, the first co-simulation testbed for carbon-aware applications and systems.
- June 2023: I’ll present our research on sustainable federated learning at the Software Campus Summit 2023.
- April 2023: We have three new student workers starting at DOS this month, growing our team on the Synergy project to five people.
- March 2023: I presented or current research on leveraging renewable excess energy in federated fearning at the Low-Carbon and Sustainable Computing seminar series organized by the University of Glasgow.
- January 2023: I’m visiting the IRIT in Toulouse for two weeks to collaborate on their DATAZERO2 project.
- November 2022: Our solution Lowcarb won the 1st price in CarbonHack22 organized by the Green Software Foundation.
- October 2022: This winter semester I’ll supervise our Master Project: Distributed Systems, which will be the first course on Carbon-Aware Computing at TU Berlin.
- August 2022: We presented Cucumber at Euro-Par 2022 in Glasgow.
- July 2022: I have been invited to a discussion on carbon-aware computing in the Environment Variables podcast of the Green Software Foundation. Listen to the episode here!
- June 2022: Our paper Cucumber has been featured in a BIFOLD blog article and a press release by TU Berlin.
- May 2022: We’re organizing the 2nd iteration of our workshop on Testing Distributed IoT Systems (TDIS), submit your work by June 21!
- March 2022: I will be visiting Lauritz Thamsen and Dimitrios Pezaros for a research stay at the Glasgow Systems Section of the Univesity of Glasgow for four months.
- February 2022: This month my Software Campus project on synergies between distributed power generation and edge intelligence starts in collaboration wiuth Huawei. I’ll be leading this project over the next two years.