Sebastian is an associate in Reed Smith's State Tax Group.
- Pennsylvania State University, The Dickinson School of Law, 2013, J.D., magna cum laude, Woolsack Honor Society, Penn State Law Review
- University of Mary Washington, 2009, B.A., Political Science, cum laude
- 17 Jan 2018 "Sales Tax Collections Hanging on Mass. Rule, SCOTUS Ruling" The Boston Globe