Baton Rouge, LA - Robert Francis O'Connell died peacefully at home on March 24, 2026 holding the hand of his wife, Josephine O'Connell. Robert was born on April 22, 1933 in Athlone, Ireland to William and Kitty O'Connell. From an early age, Robert excelled at school (with the Marist Brothers), where he developed a strong interest in math and science. He earned a life-changing scholarship to the National University of Ireland (Galway) from which he graduated with a BS in Physics in 1953. He journeyed to the United States in 1958 and obtained a PhD in Physics from the University of Notre Dame in 1962. He joined the faculty of the LSU Department of Physics & Astronomy in January 1964, retiring 53 years later as one of the longest-serving tenured Professors at LSU.

Over his storied career, he published more than 350 papers on theoretical physics and served as an editorial board member and advisor on multiple physics journals. He was selected as a Boyd Professor, one of the highest honors given to faculty at LSU. He was also inducted into the College of Science Hall of Distinction in 2018. Robert served as Vice President and President of the Faculty Senate at LSU. He established an international reputation in physics, working with colleagues across the globe. He was deeply honored by the Symposium on the Interface of Quantum and Statistical Physics and Relativity hosted by LSU in 2023 and spearheaded by his dear friend and colleague, Professor Wolfgang Schleich of Ulm University, Germany. He was also featured in a Reveille Article, "Joule of the School" in which he gave a quote that sums up his career: "Physics is my thing."

Robert liked physics, but the true love of his life was his wife, Josephine who supported him and enabled all he accomplished. He is survived by his wife, his sister, Ann Colleran, and his 3 daughters and their families: Eimear O'Connell; Adrienne O'Connell McNamara (Thomas) and their children, Conor, Maureen and Brigid McNamara; and Fiona Norman (Wayne) and their children, Dara Jones and Doug Norman and their families. Robert enjoyed his life and family. He was a loving father whose steady presence and support shaped the lives of his children; he was involved in his daughters' and grandchildren's day to day lives - and he always had time for a math question! He was an avid traveller who appreciated other places and cultures. He was a regular tennis player and could often be spotted walking the neighborhood in the evening with his well-worn Irish shillelagh.

True to his commitment to science, Robert donated his body to the Tulane Medical School, so the family will not have a formal funeral and interment. Looking into the night sky (with stars, planets, pulsars, black holes, and white dwarf stars) will always remind us of Robert. To a life well lived and a man well loved - Slainte.