Dear Members of the U.S. Crystallography Community,

We are at a pivotal moment for U.S. structural science. The National Academy of Sciences (NAS) has announced that, effective January 1, 2026, it will withdraw from the International Union of Crystallography (IUCr) and dissolve the U.S. National Committee for Crystallography (USNC/Cr). This action ends a long tradition of national representation and threatens the continuity of U.S. engagement with the global crystallography community.

Disordered

For summer, we have new DISORDERED and Crystoquote puzzles. Answers to the previous DISORDERED and Crystoquote puzzles are given, along with mention of those who submitted solutions as well as a few comments.

The American Crystallographic Association proudly announces the Class of 2025 ACA Fellows—an exceptional group of scientists whose groundbreaking research, impactful teaching, and dedicated service have shaped the field of crystallography and structural science in profound ways. This year’s honorees represent a remarkable spectrum of contributions, from advancing foundational methods and developing revolutionary technologies to championing education, mentoring, and equity across the global scientific community.

The American Crystallographic Association proudly recognizes three outstanding scientists whose work is advancing the frontiers of structural science:

The U.S. crystallographic community is undergoing a critical transformation. Since 2018, when the National Science Foundation (NSF) designated crystallography a “mature” field and ceased direct support for the U.S. National Committee for Crystallography (USNC/Cr), the committee has been sustained by private donations, a single NIST grant, and careful budgeting. This patchwork funding model, however, has proven unsustainable. For example, NAS is paid for its services and has not kept pace with basic USNC/Cr management responsibilities, such as updating committee appointments, maintaining its public website or interacting with IUCr.

As I’m writing this column for our summer newsletter, we are rapidly approaching our 75th annual meeting in Lombard, IL. The meeting committee and headquarters team have been working overtime to get everything in order, and to make it a fantastic celebration of our community. I would like to extend a personal pre-emptive thanks to everyone involved, from our Meeting Committee, headquarters team, session chairs, speakers and poster chairs who are all contributing to make our annual meeting one with something for everyone.

By:  Christopher Cahill | Department of Chemistry | The George Washington University

What a thrill to be asked to share a few thoughts on leadership with the ACA community. In some respects, ACA provided me with my first ‘official’ leadership opportunity when I was elected to Council as Vice President in 2014. I had been leading a research group for about 15 years at that point, yet that was a very different experience, for sure. I felt drawn to the opportunity- ACA had been my scientific home for years, and some committee work had whetted my appetite for deeper engagement. I also felt that the ACA was then at a bit of a critical crossroads, and that I could contribute to re-tooling some aspects of operations. I was not explicitly aware of this at the time, but it turns out a strength that I have is to recognize the interconnected nature of challenges and opportunities, and to recognize what is important to a diverse group of stakeholders. As my leadership journey has continued, now to include Chemistry Department Chair for the past six years, I find that recognizing and acknowledging what is important to people, and then advocating for that within institutional constructs is rewarding and provides a wonderful sense of purpose.

The ACA is proud to celebrate a major milestone in the career of Dr. James Kaduk, who has been elected a Fellow of the American Association for the Advancement of Science (AAAS)—one of the highest distinctions in the scientific community.

To Our Members and the Scientific Community:  As the leadership of the American Crystallographic Association (ACA), we remain steadfast in our commitment to the core values that define our organization: scientific excellence, integrity, inclusivity, and the free exchange of knowledge. In light of ongoing changes and challenges, we reaffirm our dedication to fostering an environment where science thrives, diverse perspectives are valued, and the highest standards of research and collaboration are upheld.

In Memoriam: George M. Sheldrick (1942–2025)

It is with profound sadness that the scientific community announces the passing of George M. Sheldrick, a pioneering crystallographer whose innovative contributions have left an indelible mark on the world of science. Born in 1942, George dedicated his career to advancing the field of crystallography, transforming the way scientists determine and understand molecular structures.

Spring is coming soon! Every year, on the 1st of April, the ACA collects nominations for its Fellows program. When I was elected a 2021 ACA Fellow, to be honest, I hadn’t put much thought into why professional organizations bother to make such distinctions. Certainly, being elected a Fellow is an honor and welcome recognition for any individual, but why do we, the ACA, The Structural Science Society, promote this type of recognition?