Rubinstein has served as an expert witness on various environmental cases and has published several peer-reviewed articles on Texas water policy. Rubinstein, appointed by Governor Rick Perry, served as chairman of the Texas Water Development Board from 2013-2015. During his tenure, he oversaw the implementation of the $2 billion State Water Infrastructure Fund for Texas. He also served as the Texas representative to the Western States Water Council, and the Border Governors’ Conference Sustainable Development worktable.