| Best Practices for Data Analysis & Archiving SIG |
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| The Best Practices for Data Analysis & Archiving SIG brings members together to help define, share, and promote community-driven standards for data analysis and archival methods in crystallography. By encouraging inclusive participation and collaboration, this group helps the structural science community work toward stronger, more transparent data practices. |
| Chair 2026 |
Johan Hattne |
| Chair Elect 2026 (Chair 2027) |
Daniel Paley |
| Secretary/Treasurer 2026-27 |
Sabine Botha |
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| Biological Macromolecules SIG |
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| The Biological Macromolecules SIG focuses on the structural characterization of biological macromolecules—including proteins and nucleic acids—using a range of techniques such as X-ray crystallography, NMR, cryo-EM, and SAXS. It serves as a hub for interdisciplinary exchange and innovation in macromolecular structure determination. |
| Chair 2026 |
Tim Stachowski |
| Chair Elect 2026 (Chair 2027) |
James Moody |
| Secretary/Treasurer 2025-27 |
TBD
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| Cryo-EM SIG |
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| The Cryo-EM SIG reflects the rapid growth of cryo-electron microscopy within structural biology, connecting researchers working with cryo-EM methods to advance technique development, share insights, and foster collaboration throughout the community. |
| Chair 2026 |
Joey Davis |
| Chair Elect 2026 (Chair 2027) |
Juan Du |
| Secretary Treasurer 2026-27 |
Edward Eng |
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| Fiber SIG |
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| The Fiber SIG represents the fiber diffraction community, promoting expertise in analyzing fibrous systems using X-rays, neutrons, electrons, and computational modeling. The group supports specialized scientific exchange and collaboration among researchers working with these unique structural challenges. |
| Chair 25/26 |
Olga Antipova |
| Secretary Treasurer 2025-26 |
Rama Sashank Madhurapantula |
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| General Interest SIG |
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| The General Interest SIG provides a forum for topics that fall outside the focus of other SIGs, offering a welcoming space for broad scientific discussion, interdisciplinary exchange, and collaboration. It also works closely with the ACA’s education programs to support learning across the crystallographic community. |
| Chair 2026 |
Matt McLeod |
| Chair Elect 2026 (Chair 2027) |
Kara Zielinski |
| Secretary Treasurer 2026-27 |
Susanna Huang |
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| Industrial SIG |
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| The Industrial SIG connects scientists who apply crystallographic methods in industrial research and development. This group promotes communication among industry professionals and supports the exchange of ideas that drive real-world applications of crystallography. |
| Chair 2026 |
Jill Chrencik |
| Chair Elect 2026 (Chair 2027) |
Margarita Tararina |
| Secretary Treasurer 2026-27 |
Ellene Mashaladis |
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| Light Sources SIG |
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| The Light Sources SIG centers on the use of advanced X-ray sources such as synchrotrons and X-ray lasers. Members collaborate to advance methods that leverage high-intensity light sources for novel experiments and optimized structure determination. |
| Chair 2026 |
Bob Fischetti |
| Chair Elect 2026 (Chair 2027) |
Melissa Carrillo |
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| Materials SIG |
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| The Materials SIG promotes the development and application of crystallographic tools and methods to address challenges in materials science, from sustainability and catalysis to chemistry and physics. It supports research that pushes the boundaries of how we understand and design materials. |
| Chair 2026 |
Rebecca Smaha |
| Chair Elect 2026 (Chair 2027) |
Megan Butala |
| Immediate Past Chair |
Hao Liu |
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| MicroED SIG |
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| The MicroED SIG is dedicated to Micro Electron Diffraction (MicroED), a method for determining structures from nanocrystals. This SIG provides a community for scientists working with MicroED to share insights, refine techniques, and expand the method’s applications. |
| Chair 2026 |
Johan Unge |
| Chair Elect 2026 (Chair 2027) |
M. Jason de la Cruz |
| Secretary Treasurer 2026-27 |
Dmitry Eremin |
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| Neutron Scattering SIG |
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| The Neutron Scattering SIG supports scientists working with neutron scattering techniques, encouraging exchange of best practices, collaboration, and advancement of methods for probing structural and dynamic properties of materials. |
| Chair 2026 |
Hayden Evans |
| Chair Elect 2026 (Chair 2027) |
Danielle Yahne |
| Immediate Past Chair |
Duminda Sanjeewa |
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| Powder Diffraction SIG |
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| The Powder Diffraction SIG champions research and technique development in powder diffraction, fostering communication among researchers who use these methods to explore material and molecular structures. |
| Chair 2026 |
Athena Chen |
| Chair Elect 2026 (Chair 2027) |
Sikhumbuzo Masina |
| Immediate Past Chair |
Saul Lapidus |
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| Small Angle Scattering SIG |
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| The Small Angle Scattering (SAS) SIG connects scientists using small angle scattering with X-rays or neutrons to reveal structural and dynamic information about macromolecules and materials. It promotes idea sharing and methodological development within this broad community. |
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Chair 2026
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Estella Yee
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| Chair Elect 2026 (Chair 2027) |
James Byrnes |
| Secretary Treasurer 2026-27 |
Sarah Uttormark |
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| Service SIG |
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| The Service SIG supports practitioners of service crystallography, offering a friendly and collaborative network for those who provide crystallographic expertise to research groups, collaborators, or external users. It’s a community built on shared experience, practical problem-solving, and peer support. |
| Chair 2026 |
Carla Slebodnick |
| Chair Elect 2026 (Chair 2027) |
Alexander Erickson |
| Secretary Treasurer 2026-27 |
William Hearne |
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| Small Molecules SIG |
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| The Small Molecules SIG promotes research and discussion on crystallographic methods related to the determination and analysis of small molecule structures. It actively sponsors sessions that highlight cutting-edge discoveries and applications in this core area of structural science. |
| Chair 2026 |
Josh Chen |
| Chair Elect 2026 (Chair 2027) |
Nobuyuki Yamamoto |
| Secretary Treasurer 2025-26 |
Ashley (Weiland) Schmidt |
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| Young Scientist Interest Group (YSIG) |
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| The Young Scientist Interest Group supports students, postdocs, and early-career researchers as they transition from training into professional research or industry roles. YSIG fosters networking, skill-building, career development, and community engagement for emerging structural scientists. |
| Chair 2026 |
Jayoh Hernandez |
| Chair Elect 2026 (Chair 2027) |
Alexis Davidson |
| Secretary Treasurer 2025-26 |
Susanna Huang |
