Structure Matters!

Welcome to the American Crystallographic Association. The American Crystallographic Association, Inc. (ACA) is a non-profit, scientific organization of over a thousand members in more than thirty-five countries. The ACA was founded in 1949 through a merger of the American Society for X-Ray and Electron Diffraction (ASXRED) and the Crystallographic Society of America (CSA). The objective of the ACA is to promote interactions among scientists who study the structure of matter at atomic (or near atomic) resolution. These interactions will advance experimental and computational aspects of crystallography and diffraction. Understanding the nature of the forces that both control and result from the molecular and atomic arrangements in matter will help shed light on chemical interactions in nature.


Membership in the ACA is open to any person who is actively interested in the purposes of the Association. The ACA welcomes everyone from students to retirees. All of our members contribute to the life and vigor of the Association.

Your membership helps the ACA share our scientific passions and accomplishments through different approaches, including the annual conference, our publications and educational outreach.

The ACA was established to connect scientists and anyone interested in crystallography and the ACA strives to continue to reach that goal today. As we progress forward the ACA remembers and memorializes our past crystallographic discoveries and achievements. It is with our history and achievements that the ACA hopes to inspire future generations of explorers, scientists and crystallographers.

As a student, let the ACA inspire you to dive into physics, math and chemistry. As a grad or undergrad let the ACA help you establish your professional network. Regular members share research, accomplishments and curate industry connections. Retired members help remember our history and encourage future crystallographers.


Call for Nominations!

The ACA recognizes distinguished achievement in the field of crystallography to both mature and early career crystallographers through the presentation of various annual awards and prizes.

The ACA relies on its experienced membership to recognize and bring attention to the accomplishments and contributions of their fellow members and colleagues. Complete and submit a nomination today:

2021 Buerger Award
2021 Warren Award
2021 Etter Award
Nominate an ACA Fellow


Get Social With Us!  

Catch up on the crystallography world and find out what the ACA is up to.  

Find the ACA, follow the ACA and share the ACA on:


Have an event or announcement that you want to share - tell us about it!  

 70th ACA Annual Meeting

Add the 2020 ACA Annual Meeting to your calendar today!   

Follow us on Twitter for updates on the 2020 meeting:


IUCr World Directory! 

Don't forget to add your info to the IUCr World Directory.  


Add a Resume or CV to your ACA Profile!  

As fall approaches make sure your ACA profile is up to date.  This helps us keep in touch with news, upcoming events and membership information!  

We have added new profile features.  Now you can edit your profile to include a photo and resume or CV.    Log in today!

Find a PDF with instructions on how to upload a photo and CV/resume HERE.