2025 SIG Officers & Governing Information/Documentation
Scientific Interest Groups (SIGs) are a cornerstone of the ACA, bringing together members who share a passion for specific disciplines within the field of crystallography. With fourteen SIGs representing diverse areas of focus, members can delve into their specialties while enjoying access to the broader range of crystallographic techniques and applications. Membership in SIGs is open to all ACA members at no additional cost.
SIGs provide a unique platform for members to connect with others who share similar scientific goals, challenges, and interests. By joining a SIG, you gain access to a vibrant community of peers dedicated to advancing crystallographic research.
SIGs play a vital role in fostering collaboration and enhancing the scientific exchange within the ACA. They are designed to:
- Facilitate engaging scientific discussions and collaborations within specialized areas of crystallography.
- Promote networking opportunities for new, current, and retired members alike.
- Contribute to the annual meeting programming by organizing at least one half-day session every two years, giving members a chance to shape the content of these important events.
Joining the ACA and participating in SIGs is your gateway to building meaningful connections, broadening your professional network, and becoming part of a community that shares your interests and scientific pursuits. Whether you’re exploring cutting-edge techniques or collaborating on impactful research, SIGs offer an inclusive and inspiring environment to thrive.
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Best Practices for Data Analysis & Archiving SIG
The BPDAA SIG was created to join the major effort in the international community to standardize best practices in data analysis and archival and further, to improve community involvement in these best practices.
SIG Governing Documents
SIG Homepage (ACA Members Only)
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CHAIR 2025: Dorothee Liebschner
CHAIR-ELECT 2025/CHAIR 2026: Johan Hattne
SECRETARY-TREASURER 2024-2025: Jean Jakoncic
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Past Officers:
CHAIR 2024: Christine Beavers
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Biological Macromolecules SIG
The BioMac SIG focuses on characterization of biological macromolecules, particularly proteins and nucleic acids, using a variety of structural methods such as X-ray crystallography, NMR, EM and SAXS.
BioMac SIG Bylaws/Constitution/Governing Documents
BioMac Reports (ACA Members Only)
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CHAIR 2025: George Lountos
CHAIR-ELECT 2025/CHAIR 2026: Tim Stachowski
SECRETARY-TREASURER 2025-2026: James Moody
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Past Officers:
CHAIR 2024: Tori Drago
SECRETARY-TREASURER 2022-2024: Darya Marchany-Rivera
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Canadian Division
As the North American Regional Affiliate of the International Union of Crystallography (IUCr), the ACA plays a significant role in promoting the applications and techniques of crystallography beyond U.S. borders. The ACA represents all of North and South America to the global scientific community. Canada is the largest single country outside the United States to contribute to the goals and purposed of the ACA. The Canadian Division exists therefore to promote the interests of Canadian members and to provide for an elected official to represent these interest on the ACA Council.
Canadian Division SIG Bylaws/Constitution/Governing Documents
Canadian Division Reports (ACA Members Only)
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CHAIR 2024/2025: Louise Dawe
SECRETARY-TREASURER 2025-2026: Joy-Lynn Kobti
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Past Officers:
SECRETARY-TREASURER 2023-2024: Joy-Lynn Kobti
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CryoEM SIG
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CHAIR 2025: Alexis Rohou
CHAIR-ELECT 2025/CHAIR 2026: Joey Davis
SECRETARY-TREASURER 2024-2025: Yirui Guo
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Past Officers:
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Fiber SIG
The Fiber SIG represents the interests of fiber diffraction specialists and application of fiber diffraction in interdisciplinary studies. This is a diverse group that employs the use of X-rays, neutrons and elections in diffraction experiments in addition to modern computational molecular modeling approaches.
This SIG meets every other year, with the next meeting scheduled for 2026. This SIG also only participates in elections every other year. The next year to include candidates for this SIG will be the election of 2026 with officers to being their position on January 1, 2027.
Fiber SIG Bylaws/Constitution/Governing Documents
Fiber SIG Reports (ACA Members Only)
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CHAIR 2025/26: Olga Antipova
SECRETARY-TREASURER 2025-2026: Rama Sashank Madhurapantula
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Past Officers:
CHAIR 2023/24: Joseph Orgel
SECRETARY-TREASURER 2023-2024: Olga Antipova
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General Interest SIG
The General Interest SIG provides a forum for presenting topics of general interest that are outside the scope of the other sessions organized by the SIG's at the annual meetings. The General Interest SIG also has an educational mandate executed in close collaboration with the Education Committee.
General Interest SIG Bylaws/Constitution/Governing Documents
General Interest Reports (ACA Members Only)
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CHAIR 2025: Zhen Xu
CHAIR-ELECT 2025/CHAIR 2026: Matt McLeod
SECRETARY-TREASURER 2024-2025 Mrittika Roy
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Past Officers:
CHAIR 2024: Tim Stachowski
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Industrial SIG
The Industrial SIG represents the interest and activities of industrial scientists for the advancement of all aspects of the application of crystallographic techniques in industrial settings and to promote communication between scientists working with crystallography in the industry.
Industrial SIG Bylaws/Constitution/Governing Documents
Industrial SIG Reports (ACA Members Only)
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CHAIR 2025: Susmith Mukund
CHAIR-ELECT 2025/CHAIR 2026: Jill Chrencik
SECRETARY-TREASURER 2024-2025: Joyce Frank
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Past Officers:
CHAIR 2024: Chelsy Chesterman
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Light Sources SIG
The domain of the Light Sources SIG is extremely intense X-ray sources such as storage rings and X-ray lasers. SIG members develop technology and methods to optimize crystal structure determination using these sources, as well as to perform novel experiments and not possible with laboratory X-ray generators.
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CHAIR 2025: Artem Y. Lyubimov
CHAIR-ELECT 2025/CHAIR 2026: Bob Fischetti
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Past Officers:
CHAIR 2024: Jennifer Wierman
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Materials SIG
The Materials SIG promotes the development and application of crystallographic tools and methods necessary to tackle materials problems ranging from catalysis and sustainability to fundamental chemistry and physics.
Materials SIG Bylaws/Constitution/Governing Documents
Materials SIG Reports (ACA Members Only)
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CHAIR 2025: Hao Liu
CHAIR-ELECT 2025/CHAIR 2026: Rebecca Smaha
PAST CHAIR : Huiwen Ji
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Past Officers:
CHAIR 2023: Jue Liu
CHAIR 2024: Huiwen Ji
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Powder Diffraction SIG
The Powder Diffraction SIG advocates for scientists that utilize or further develop powder diffraction techniques to investigate the structures of compounds and materials.
Powder SIG Bylaws/Constitution/Governing Documents
Powder SIG Reports (Members Only)
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CHAIR 2025: Saul Lapidus
CHAIR-ELECT 2024/CHAIR 2025: Athena Chen
PAST CHAIR: Daniel Olds
Past Officers:
CHAIR 2023: Wenqian Xu
CHAIR 2024: Daniel Olds
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Service SIG
The purpose of the Service SIG is to further the advancement of all aspects of the application of service crystallographic techniques and to promote communication between persons interested in such techniques and results. We are a group of friendly, supportive colleagues and a great resource in questions related to service crystallography and beyond.
Service SIG Bylaws/Constitution/Governing Documents
Service SIG Reports (ACA Members Only)
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CHAIR 2025: Nathaniel Barker
CHAIR-ELECT 2025/CHAIR 2026: Carla Slebodnick
SECRETARY-TREASURER 2024-2025: Michael R. Gau
Past Officers:
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Small Molecules SIG
The Small Molecules SIG promotes and and all applications of crystallographic techniques to the determination, analysis and presentation of structures of small molecules. This group is very active in sponsoring scientific sessions that focus on cutting edge areas of small molecule discovery and application.
Small Molecules SIG Bylaws/Constitution/Governing Documents
Small Molecule SIG Reports (ACA Members Only)
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CHAIR 2025: Daniel Decato
CHAIR-ELECT 2025/CHAIR 2026: Josh Chen
SECRETARY-TREASURER 2025-2026: Ashley (Weiland) Schmidt
Past Officers:
CHAIR 2024: Veronica Carta
SECRETARY-TREASURER 2023-2024: Lauren Depue
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Young Scientist Interest Group (YSIG)
The YSIG addresses the needs and concerns of students, graduate students and post-doctoral fellows who are making the transition from education to the workplace or research establishments. Those early on in their careers will find an abundance of resources for networking, job opportunities and exchange ideas and research techniques.
YSIG Bylaws/Constitution/Governing Documents
YSIG Reports (ACA Members Only)
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CHAIR 2025: Kara Zielinski
CHAIR-ELECT 2025/CHAIR 2026: Jayoh Hernandez
SECRETARY-TREASURER 2025-2026: Susanna Huang
Past Officers:
CHAIR 2024: Niko Vlahakis
SECRETARY-TREASURER 2023-2024: Kristofer Gonzalez-DeWhitt
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