Sebastian attended the University of Houston where he majored in Public Relations/Advertising and commissioned as a Second Lieutenant in the Marine Corps in 2009 through the Naval ROTC. He was designated as an Artillery Officer, and after subsequent training, he was assigned to 5th Battalion, 11th Marines. He deployed to Afghanistan as a fire direction officer, and upon returning, he held the positions of platoon commander and executive officer. Sebastian currently serves as the Officer Selection Officer for San Jose and the Pacific Territories. He also serves on the Board of Directors for a Bay Area non-profit, the Wine Country Marines. He is married to his wife Rachael and will be attending Duke’s Fuqua School of Business in the fall of 2016.