The recording and the slides of our latest #BOSWebinar with Didier Aussel are available! 🎥 Recording: youtu.be/TSelremyljc?... 📄 Slides: bileveloptimization.org/bos_webinar/... 🔗 More information on the #BOS Webinar Series: bileveloptimization.org/bos_webinar/ #Bilevel #BilevelOptimization

Join us for the last session of the #BOSWebinar before the summer break! The session on June 23 at 4 PM CEST will feature two 20-minute talks by Sebastian Vasquez and Noah Weninger. 🔗 More information on the #BOS #Webinar series can be found at: bileveloptimization.org/bos_webinar #Bilevel

📢 Travel discount for #ISMP2027 participants Benefit from a 10% discount on Air France and KLM flights: ismp2027.mathopt.nl/img/travel/f... ✈️ Reservations: July 25, 2026 – July 30, 2027 ✈️ Departures: July 18–30, 2027 ✈️ Returns: July 25, 2027 – August 6, 2027 🔗 ismp2027.mathopt.nl #MOS

Join us today at 4 PM CEST for the next #BOSWebinar with Didier Aussel! 🔗 More information on the #BOS Webinar Series and upcoming talks can be found at: bileveloptimization.org/bos_webinar #MathematicalProgramming #SLMF #MLMF #BilevelOptimization #MOS

Don't miss the next #BOSWebinar on June 9 at 4 PM CEST, featuring a 40-minute presentation by Didier Aussel. 🔗 bileveloptimization.org/bos_webinar 📩 Details will be shared via the BOS mailing list. Not a #BOS member? Register for free at bileveloptimization.org/membership! #BilevelOptimization

🎥 The recordings of our last #BOSWebinar with Bo and Sadegh are now available to rewatch on our YouTube channel: 🎙️ Bo Lin: youtu.be/U75v_IkLxd4?... 🎙️Mohammad Sadegh Salehi: youtu.be/G1LUtJd8FDU?... #MOS #MathematicalProgramming #Bilevel #BilevelOptimization #BOS

Join us today at 4 PM CEST for the #BOS Webinar with Bo and Sadegh! 📩 If you are not yet a (free) BOS member and have not received the meeting details, text me if you would still like to join. 🔗 bileveloptimization.org/bos_webinar #MachineLearning #Bilevel #Optimization #BilevelOptimization #MOS

The next #BOSWebinar takes place on May 26 at 4 PM CEST, featuring two 20-minute talks by Bo Lin and Mohammad Sadegh Salehi. 📩 Details will be shared via the #BOS mailing list. Not yet a BOS member? Register for free at bileveloptimization.org/membership. 🔗 bileveloptimization.org/bos_webinar

📚 Excited to share the pre-publication PDF of our book Linear and Mixed-Integer Bilevel Optimization: Theory and Algorithms (with Ivana Ljubić and @schmaidt.bsky.social), which is now in production with CUP. 🔗 You can access it at yasminebeck.github.io/files/bileve... #BilevelOptimization #BOS

🎥 The recording of our latest #BOS Webinar with Miguel Anjos is now available on YouTube! You can rewatch his talk here: www.youtube.com/watch?v=dg8e... 🔗 More information on the BOS Webinar Series: bileveloptimization.org/bos_webinar/ #Bilevel #Optimization #BilevelOptimization #MOS

📢 Streams for #ISMP2027 Working on a paper? With 25 streams spanning theory, algorithms, and applications, ISMP 2027 offers a place to present and discuss your latest research in mathematical programming. 📄 Submissions open on September 1, 2026! 🗓️ July 25–30, 2027 📍Amsterdam 🔗 ismp2027.mathopt.nl

Join us today at 4 PM CEST for the #BOS Webinar with Miguel Anjos! Looking forward to another exciting session and discussion. 📩 If you are not yet a (free) BOS member and have not received the meeting invitation, text me if you would still like to join. 🔗 bileveloptimization.org/bos_webinar

🎥 Our latest #BOS Webinar with Martina Cerulli and Kübra Tanınmış is now online! You can now rewatch both talks on our YouTube channel: 🎙️ Martina Cerulli: youtu.be/pNeY-EOhRvM?... 🎙️Kübra Tanınmış: youtu.be/OR9JElQ7DWE?... #BilevelOptimization #Bilevel #Optimization #MOS #MathematicalProgramming

📢 New #ORMS preprint! Our paper on exact solution methods for k-delete recoverable robust combinatorial optimization problems (with Christina Büsing and Ivana Ljubic) is now online! 🔗 Interested? You can access it here: optimization-online.org?p=34703 #RobustOptimization #BranchandCut #MILP #CCG

Don’t miss the next #BOS Webinar on May 12 at 4 PM CEST, featuring a 40-minute presentation by Miguel Anjos. 🔗 bileveloptimization.org/bos_webinar 📩 Details will be shared via the BOS mailing list. Not yet a BOS member? Register for free at bileveloptimization.org/membership! #BilevelOptimization

Don't miss the #BOS Webinar today with Martina Cerulli and Kübra Tanınmış! Join us at 4:00 PM CEST for two exciting talks and discussion. 🎥 You can now also watch the recording of our previous session with Stephan Dempe at www.youtube.com/watch?v=JI42...

Interested in #bilevel #optimization but unsure how to dive in? We've got you covered: take a look at our new book! 📚 In 18 chapters, we take you through a clear, self-contained journey into linear and mixed-integer #BilevelOptimization, bridging theory with state-of-the-art algorithms. #BOS

The next #BOS Webinar takes place on April 28 at 4 PM CEST, featuring two 20-minute talks by Martina Cerulli and Kübra Tanınmış. 🔗 bileveloptimization.org/bos_webinar 📩 Details will be shared via the BOS mailing list. Not yet a BOS member? Register for free at bileveloptimization.org/membership!

Book news 📚 A major milestone for us, the book is finally done, looking forward to sharing it with you soon! #Bilevel #Optimization #BOS

Over 60 participants joined for the kickoff of the #Bilevel #Optimization Webinar Series—what a great start! 🚀 The session featured an opening by Alain Zemkoho, followed by a talk by Stephan Dempe and a very lively discussion with the audience. Join us on April 28 for the next edition. Stay tuned!

Don't miss this opportunity to connect with leading experts and fellow young OR researchers! The abstract submission deadline for the next #EUROYoung Workshop has been extended until 24 April! Looking forward to see you in Lugano 🇨🇭, 14–16 October, 2026! #EUROYoung2026 #Lugano #ORMS

Gentle #bilevel #optimization reminder: Today and tomorrow is your last chance to submit an abstract to the "International Conference on Bilevel Optimization" ... Let's meet in Pittsburgh! bileveloptimization.org/icbo/2026/su...

🚀 Join us next Tuesday, April 14, 2026, at 4 PM CEST for the kickoff of the new #BOS Webinar Series! 🎙️ BOS President Alain Zemkoho will kickoff this new initiative, followed by Stephan Dempe who will speak about single-level reformulations of bilevel problems. Abstract👇 #BilevelOptimization #MOS

🚀 The #BilevelOptimization Webinar Series kicks off next Tuesday! Join us for the inaugural session with an opening by #BOS President Alain Zemkoho, followed by a 40-minute talk by Stephan Dempe. We hope to see many of you there! Not on the BOS mailing list yet? Send me a DM for the meeting link.

It's done! Our paper BOBILib: Bilevel Optimization (Benchmark) Instance Library (with Johannes Thürauf, Thomas Kleinert, Ivana Ljubic, and Ted Ralphs) is finally published in MPC! It’s open access. And just a reminder: The website of the library is this one: bobilib.org Use it and spread the word!

The #ICBO2026 abstract submission deadline is coming soon: bileveloptimization.org/icbo/2026/in... I hope we meet later this year in Pittsburgh! #orms #conference #bilevel #optimization

📢 Semi-Plenary Speakers for #ISMP2027! We are pleased to announce the semi-plenaries for the 26th International Symposium on Mathematical Programming. Join them to explore advances, challenges, and opportunities in mathematical optimization. 🗓️ July 25–30, 2027 📍Amsterdam 🔗 ismp2027.mathopt.nl #MOS

“MIP approaches are a dead end.” That‘s a reviewer comment I recently received on a paper about traffic modeling. So, naturally, I teamed up to write another MIP paper on traffic networks. Here’s our new #ORMS preprint: optimization-online.org?p=34014 Dead end? Judge for yourselves 😉

Chapter 6 of the upcoming book on #bilevel #optimization: General properties of mixed-integer linear bilevel problems. Classic relaxations, infeasibility via lower-level unboundedness and how to test this up-front, existence of solutions, the refinement problem, complexity, reformulations, ...

The show must go on ... final proof-reading of Chapter 5: "Algorithms for Linear Bilevel Problems". We discuss three main methods: (i) The "historic" and simplex-inspired Kth-best algorithm (ii) Complementarity-Based Branch-and-Bound (iii) Penalty Alternating Direction Method

📢 Plenary speakers for #ISMP2027 We are pleased to announce the plenaries for the 26th International Symposium on Mathematical Programming: Daniel Bienstock Jim Luedtke @optimizer.bsky.social Thomas Rothvoss Katya Scheinberg Defeng Sun 🗓️ July 25–30, 2027
 📍Amsterdam 🔗 ismp2027.mathopt.nl #MOS

#Bilevel book proof-reading update. Chapter 3: Single-level reformulations for convex lower-level problems ... A few keywords: Optimal-value function, KKT, strong-duality, big-M, McCormick, IIC, local vs. global solutions, SOS1 conditions, ...

📢 #ISMP2027 comes to Amsterdam! The 26th International Symposium on Mathematical Programming will be held July 25–30, 2027. Join researchers from around the world to discuss advances, challenges, and opportunities in the theory and practice of mathematical optimization. 🔗 ismp2027.mathopt.nl #MOS

Join us on March 5 for my #orms talk about uncertain #bileveloptimization!

Free Tuesday afternoon? Then I have something for you! 🚀 We're launching the #BOS Webinar Series—a bi-weekly seminar on theoretical, computational, and applied #BilevelOptimization 📆 Tuesdays at 4 pm CET via MS Teams
 🎙️ 40- or 2x20-minute talks + discussion
 🔗 bileveloptimization.org/bos_webinar

Proof-reading chapter 2: Optimistic vs pessimistic #bilevel problems. What is a pessimistic problem? Why is it different? And why is it actually not as different as many people thought for a long time … #orms #optimization

The 6th #EUROYoungWorkshop is coming to #Lugano, Switzerland 🇨🇭| Oct 14-16, 2026 Join us for 3 days of talks, networking & social events—inspiring plenaries and lakeside charm await! Abstract submission: 10 Mar – 15 Apr Registration: 1 May – 1 Jun 🔗 euroyoung.eu/lugano2026

Proof-reading our #bilevel #optimization book. Today: Chapter 1 about what it is all about 😉 From the content: many formal and informal examples such as pricing, toll setting, energy markets, critical infrastructure defense, interdiction problems (max-flow & knapsack) ... plus ... 1/2

A new book is coming: "Linear and Mixed-Integer Bilevel Optimization: Theory and Algorithms" by Ivana Ljubić, @yasminebeck.bsky.social, and myself. Let's start the last round of proof-reading! Stay tuned for regular updates on its content. #orms #bilevel #optimization #algorithms #textbook

Excited to be part of this season’s MOSS speaker lineup and to present what I’ve been working on lately. Don’t miss out on MOSS every first Thursday of the month, looking forward to seeing many of you there! #orms

The plenary speakers of the #ICBO2026 are confirmed. Amy Greenwald, Brown University, US Leonardo Lozano, University of Cincinnati, US Shoham Sabach, Cornell University, US More information you can find here: bileveloptimization.org/icbo/2026/in.... See you in Pittsburgh this year!

Proof-reading our new book on bilevel optimization. The content is almost finalized … Most likely, you will find it online in 2026! By the way: our = @yasminebeck.bsky.social, Ivana Ljubic, and myself! Follow here for more updates during the next weeks and months!

I cannot think of a better way to start the new year! Join us on January 27, 2026, for #ORAwarenessDay #orms

The end of the year finale EURO WISDOM #YW4OR Webinar of 2025! Great talks by @yasminebeck.bsky.social, Dr Monaci, @jasoneramirez.bsky.social and great discussion questions by @vidalthi.bsky.social Recording soon on YouTube! #WomenInSTEM

A while ago, I finished a language course on #Duolingo and was *deeply* disappointed that Duo, the owl, did NOT dance for me. But today… dreams come true 🦉💃 Duo is finally dancing! Apparently it just needed some time to warm up 🇳🇱

Today, we had the last EURO WISDOM YW4OR Webinar of 2025! 🙏 Dr Beck @yasminebeck.bsky.social, Dr Monaci, Dr Ramirez Ayerbe @jasoneramirez.bsky.social for the presentations! 🙏 Prof Vidal @vidalthi.bsky.social for the questions! Recording soon in YouTube! @euro-wisdom.bsky.social #WomenInSTEM

Save the date! The International Conference on Bilevel Optimization will take place from August 2-5, 2026, at the CMU and the University of Pittsburgh, USA! Here's all what you need to know right now: bileveloptimization.org/icbo/2026/in...

#YW4OR call for applications is still open #orms, please apply using this form (deadline November 14): 👇 docs.google.com/forms/d/e/1F...

This was hard work but now we are happy! The #BOBILib paper has today been accepted for publication in Mathematical Programming Computation! Here's the final version of the preprint: optimization-online.org/wp-content/u...! And here's the website bobilib.org! Spread the word and use it! :-)

Thanks to the best supervisor! 🙏 If you are interested, feel free to check out my award-winning thesis. It’s only ~300 pages 😅 TL; DR: If you are attending #OR2025 in Bielefeld, you can still join me today at TC-4 in H6, where I will present (some of) the results. #orms @unitrier.bsky.social