2021 American Crystallographic Association Election

The growth and success of the ACA is the result of member input and the energetic efforts of many ACA member volunteers.   Learn more about this years candidates...

We invite our members to join us for Coffee With the Candidates on Friday, October 22 at 3:00 PM ET (Pre-registration Is Required).  Much like our "Coffee With Council", this informal event will provide an opportunity for ACA members to get to know the 2021 ACA officer, committee and SIG candidates. We invite all ACA members to attend, meet the candidates and get the information you need to confidently cast your vote.

71st ACA Annual Meeting: Session Videos Are Now Available!

Attendees can view all session and workshop recordings by logging into their ACA account and navigating to the 2021 ACA Annual Meeting homepage. Videos are embedded on their respective session pages along with the ability to review the abstracts and the ability to contact authors/speakers.

Scientists interested in molecular and materials structure with specialties in biology, chemistry, geosciences, materials science and more will converge virtually for the 71st Annual Meeting of the ACA. The theme for the 2021 meeting is “Structural Science Awakens,” which celebrates the ACA’s new tagline “The Structural Science Society.” Scientific sessions and workshops will highlight new developments in single-crystal and powder diffraction, scattering, cryo-EM, micro-electron diffraction, and advanced capabilities at national x-ray, neutron, and EM facilities.

Attendee Login
Poster Prize Winners
Etter Award Winners


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.


Fall 2021 RefleXions


72nd ACA Annual Meeting

The ACA Meeting is an annual event providing scientists from a wide variety of backgrounds the opportunity to exchange cutting edge ideas and techniques in multiple areas of research. Each meeting highlights various aspects of crystallography and demonstrates their significance to the greater scientific community. More details coming soon!  

Save the Dates!  

Tentative Schedule:
Workshops & Opening Reception: Friday, July 29, 2022
Sessions Day One: Saturday, July 30, 2022
Sessions Day Two: Sunday, July 31, 2022
Sessions Day Three: Monday, August 1, 2022
Sessions Day Four & Banquet: Tuesday, August 2, 2022


1401 SW Naito Parkway
Portland, Oregon 97201 USA

[ACA Hotel Block Details Available Soon!]