The Memorial Tribute to the Great Hani Mahmassani at INFORMS

All those who had the pleasure of knowing Hani Mahmassani, who passed away on July 15, 2025 at the age of 69, will never forget him. He has left us with an incredible void, but lucky are we who were his friends, and/or his students,  and/or colleagues, or collaborators.

Many thanks to Yue Wang of the University of Arizona, who prepared this poster notice for the  Transportation Science and Logistics (TSL) Society memorial tribute event in honor of Hani Mahmassani that took place last week at the INFORMS Conference in Atlanta.

The session began with a Zoom presentation by Roberto Roberti of Italy, this year's recipient of the Stella Dafermos Mid-Career Award, and then it was time for our panel, which was chaired by Karen Smilowitz of Northwestern University, a colleague of Hani's.

At the beginning, we gathered for a photo with Pat Mokhtarian, of Georgia Tech, who joined us. Pat was elected to the National Academy of Engineering, as Hani had been earlier.

Srinivas Peeta of Georgia Tech had prepared the nice collage poster of photos that some of us had also contributed to.

The talks were incredibly touching with Srinivas Peeta speaking about Hani, as his PhD advisor, and colleague, with numerous photos over the years of many luminaries in transportation science. He emphasized what a great researcher Hani was and also an outstanding organizer, integrator, and mentor. 

In my presentation, which is available here:  https://supernet.isenberg.umass.edu/visuals/Hani-Tribute-INFORMS-Nagurney.pdf, I included photos taken over many years of activities, including service ones, I had engaged in with Hani. So many memories came flooding back and I can hear his voice. Hani always inspired us to reach higher and to do more. He stretched us professionally and personally with his many kindnesses and support.

Marco Nie, a colleague of Hani's at Northwestern, had used ChatGPT for his presentation slides, and it was fascinating to see what was picked up by AI in terms of the contributions of Hani's research to transportation science, such as his work on bounded rationality and traffic assignment, and dynamic traffic network equilibrium.

Mike Hyland of UC Irvine, and a former PhD student of Hani's, spoke from the heart about how it was to work with Hani, who only slept a few hours a night. Hani was always willing to listen and to push the frontiers of transportation research and practice. He supervised over 75 PhD theses. 

We then took the group photo below. Thanks to all who were able to join us for this touching memorial session in honor of Hani Mahmassani. 

Thank you, Hani, for your friendship, scholarship, leadership, and for being a visionary.

For the In Memoriam, co-authored by Karen Smilowitz and Marco Nie, and published in the journal Transportation Science, see here: https://pubsonline.informs.org/doi/10.1287/trsc.2025.memorial.v59.n6

The In Memoriam ends as follows: "In 1997, Hani wrote a tribute to Robert Herman in Transportation Science. He closed his tribute with the following words that ring so true to us as we remember Hani: “I will miss him, and so will many others, but will always know that I am a richer person for having known him.”"

Slide Decks of Our Talks at INFORMS in Atlanta Are Now Posted on Topics from War Risk Insurance to Tariffs and Rerouting to Remembering the Great Hani Mahmassani

My immediate research group had five presentations at the recent INFORMS Conference, which took place in Atlanta, October 26-29, 2025.

I am delighted that the slide decks of all the above presentations have now been posted on the Virtual Center for Supernetworks website: https://supernet.isenberg.umass.edu/visuals.html.

Below is a photo of the speakers and the organizers (thanks to Himadri Sen Gupta and Andrés González for the invitation) of the Resilient Networks session in which Ismael Pour, my PhD student, presented our paper on integrated crop and cargo war risk insurance with applications to Ukraine. This paper we co-authored with Borys Kormych of the Odesa Law Academy and it was published in the International Transactions in Operational Research and is available free access: https://onlinelibrary.wiley.com/doi/10.1111/itor.70038?af=R

My PhD student, Samira Samadi, presented two papers (since I had to speak on a panel memorializing Hani Mahmassani, who passed away on July 15, 2025).

Samira's first paper presentation, which was on fresh produce quality deterioration under transportation congestion and disruptions, was on work we did with Deniz Besik of the University of Richmond. Her second paper, which we co-authored, was on tariffs and rerouting, and is in press in a volume in honor of Terry Rockafellar's 90th birthday: https://link.springer.com/book/9783032078599.

Dana Hassani delivered a paper of ours in the 8AM session on the last day of the conference. The paper, with Oleg Nivievskyi and Pavlo Martyshev of the Kyiv School of Economics (KSE), was published in an edited Dynamics of Disasters volume by Springer last December: https://www.springerprofessional.de/en/quantification-of-international-trade-network-performance-under-/50390576

I will blog about the panel in honor of Hani Mahmassani in a separate post but below I share a photo of the entire group that took part. Thanks to Karen Smilowitz and to the Transportation Science and Logistics (TSL) Society of INFORMS for allowing us to memorialize Hani in a session originally scheduled for the Robert Herman Lifetime Achievement Award recipient, who could not make it (Cynthia Barnhart of MIT was recognized this year). Hani was an earlier recipient of this award.