Bryna Rebekah Kra (born 1966) is an American mathematician and the Sarah Rebecca Roland Professor at Northwestern University.
In particular Kra has made significant contributions to the structure theory of characteristic factors for multiple ergodic averages.
In 2010 Kra was awarded the Levi L. Conant Prize for her expository article "The Green–Tao theorem on arithmetic progressions in the primes: an ergodic point of view".
[5][6] In 2006 she was an invited speaker at the International Congress of Mathematicians in Madrid ("From combinatorics to ergodic theory and back again"),[7] and was named an AMS Centennial Fellow the same year.
[12] Kra was elected to the 2023 class of fellows of the Association for Women in Mathematics "for her vision and work creating programs to support women in mathematics, especially GROW (Graduate Research Opportunities for Women) and AWM student chapters; for her leadership in the mathematics community, including serving on the AWM Executive Committee and serving as president of AMS; and for making advocacy for women a priority throughout her career.