73rd ACA Annual Meeting

We are delighted to extend an invitation for you to attend the 73rd annual meeting of the American Crystallographic Association which will be held from Friday, July 7th to Wednesday, July 12th, 2023 as a fully in-person meeting. Scientists interested in biological, chemical, and material structures will travel to the waterfront in Baltimore, MD.

ACA2023 Homepage
Register for the Conference
Reserve Your Hotel Room
Submit an Abstract

RefleXions Spring 2023


Call for Submissions

The Education Committee is currently searching for submissions to the ACA Video Portal!  The deadline to submit a video for consideration in the contest is April 1, 2023!  Read more about the library, VIDEO CONTEST and how you can contribute...



Membership @ ACA

Crystallography and structural science have been and continue to be on the forefront of major discoveries in the life sciences, medicinal chemistry, and materials science. The American Crystallographic Association, Inc. (ACA) is the home for over 1,000 structural scientists all over the world who are united by the common purpose to “promote interactions among scientists who study the structure of matter at atomic (or near atomic) resolution”.



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.  Read about all of the benefits that an ACA membership can bring to you...

Call for Expressions of Interest

The 2023 Nominating Committee (Stacey Smith, Andy Howard, David Rose) is issuing an open call for expressions-of-interest for the following opportunities to participate in ACA Leadership.  Read about the opportunities in leadership and send us an expression of interest today!


Call for Nominations: Fellows & Awards

The ACA recognizes distinguished achievement in the field of crystallography 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.

In addition to nominating an ACA Fellow, there are three award categories honoring individuals for distinction in the field of crystallography and structural science and this year we are accepting nominations for the following :

Bertram Eugene Warren Diffraction Physics Award:  To recognize an important recent contribution to the physics of solids or liquids using X-ray, neutron, or electron diffraction techniques. Works published within a six-year period ending June 30 of the year preceding the Award may be nominated. 

M.J Buerger Award: To recognize mature scientists who have made contributions of exceptional distinction in areas of interest to the ACA. There are no restrictions as to nationality, race, sex, religion, or membership in the ACA.

Margaret C. Etter Early Career Award: To recognize outstanding achievement and exceptional potential in crystallographic research demonstrated by a scientist at an early stage of their independent career. 

(ACA 2022 President Diana Tomchick bestowing the Margaret C. Etter Early Career Award to Brent L. Nannenga in Portland in July of 2022 - photo by: C. Bourne)


Fellows: An ACA Fellow is defined as "a Member whose efforts on behalf of the advancement of crystallography or its applications that are scientifically or socially distinguished." If you know of a deserving individual please submit a nomination.  Nominations are due each year by April 1st and the next class will be announced in the summer of 2023. 

If you know a commendable individual, this is the opportunity to recognize their contributions by nominating them.  Please send your completed nomination packet to [email protected] by April 1, 2023.

Awards will be presented at the 2024 ACA Annual Meeting and the Class of 2023 Fellows will be welcomed at ACA2023. For information and to submit a nomination, visit: https://acas.memberclicks.net/awards