May God bless you and your...
If belief in a person means friend, then it is so. May God bless you.
Tania May Ceolin
January 14, 2026


Naperville, Illinois
Sep 15, 1941 – Nov 18, 2025
BARDEEN--William Allan. William Allan Bardeen, husband, father and physicist, passed away November 18, 2025, in Warrenville, IL his home for over 30 years. Bill was born September 15, 1941, in Washington PA and grew up in Summit, NJ and Champaign-Urbana, IL where he attended University High...
Read MoreIf belief in a person means friend, then it is so. May God bless you.
Tania May Ceolin
January 14, 2026
Bill and I were in the same class year, 1958, at University High School. We both played on the school basket ball team. I remember him as competitive, but willing to pass the ball to a teammate who was open. In our senior year we were in a special math class. We learned differential and integral calculus and infinite series. I learned later the content of the class was usually taught at the Sophomore level at the university. It was in this class that I experienced Bill as always in good...
Peter Kenneth Carlston
January 10, 2026
I am saddened by our loss. My life was enriched by spending time with you and the family. Karen was a great friend of mine in high school and college. I have fond memories of my time with your family, from skiing in Breckenridge, the trip to Santa Barbara, going to Milwaukee and Cub games with Karen and Chuck. The picture above transported me back to the high school days. That's exactly how I remember you. Karen, Chuck, and Marge, you have my deepest condolences. Thank you for the...
Chris Condon Howell
December 19, 2025 | Friend
Bill, you are such an important part of our physics community. You built something truly special with the Fermilab theory group, and I feel so lucky to have spent time there. Beyond being an extraordinary physicist, you embodied something we too often forget: the importance of making a workplace welcoming to everyone. You cared about all of us - whether it was cleaning the coffee machine carpet, asking if we had "solved any great problems today," or, for me, our daily chat over coffee and a...
Innes Bigaran
December 02, 2025 | Work
I often thought Bill was like my own dad over the years. The Bardeens are very dear friends of mine from childhood days and have a cherished place in my heart. They will always be a part of my extended family. Thinking of Marge, Karen and Chuck during these sad times... though knowing that Bill´s legacy will always carry forth in his contributions that he´s made in the scientific world and embedded in the wonderful spirits of the family he´s left behind. Xo
Kendra Kroll
November 30, 2025 | Friend
What a lovely man and family! The Bardeen family contributions to science will be lasting.
Ken Wyatt
November 30, 2025 | Friend
The world is going to miss you Bill, I know I will. Hope you can find some good puzzles to work on.
Kylar Greene
November 27, 2025

Cluster of 50 Memorial Trees
Andreas Kronfeld and Liz Sexton-Kennedy
November 27, 2025 | Geneva
We will miss you dearly, Bill! It was always a highlight to see and talk with you at Fermilab.
Felix Yu
November 27, 2025