The award is given jointly by the Mathematical Optimization Society and the American Mathematical Society once every 3 years. According to the citation,
“Computing the volume of a convex body is an ancient challenge. Cousins and Vempala develop a fast algorithm that approximates the volume of a well-rounded convex body while querying membership of a cubic number of points, and also present the fastest algorithms for integrating and sampling from a Gaussian measure restricted to a convex body. The impact of the ideas goes far beyond the two core problems addressed.”
https://www.ams.org/news?news_id=7345
https://cos.gatech.edu/news/research-duo-awarded-fulkerson-prize