Prior to taking the bench, Judge Couvillier was a Founding Partner of Kennedy & Couvillier, PLLC. Prior to establishing Kennedy & Couvillier, PLLC, he was a Partner at Lionel Sawyer & Collins and Managing Partner at Black & LoBello. Judge Couvillier served as the General Counsel of The Legal Aid Center of Southern Nevada (2011-2013) and then as President of the Board of Directors (2014-2023). Judge Couvillier also served as President of the Nevada Latino Bar Association and Chair of the State Bar of Nevada Litigation Section.

Judge Couvillier received his law degree from California Western School of Law, graduating cum laude, and his Bachelor of Arts in Political Science from the University of California at San Diego (Thurgood Marshall College).