Loeber was a graduate of the Newman School in New Orleans, a Phi Beta Kappa graduate of Princeton University where he was valedictorian of his class, and a summa cum laude graduate of the Harvard Law School where he was the Developments Editor of the Law Review. After his service in the Office of the General Council of the Air Force he joined Sullivan & Cromwell where he spent his entire career and served on the managing committee. He served on several corporate boards but also made time to serve on the boards of many non-profit organizations. He is survived by his wife of 60 years, Barbara Gordon Landau, son Gordon Loeber Landau, daughters Blair Trippe and Donna Hardiman and her husband John, and his adored grandchildren, Katherine and Elizabeth Hardiman and Victoria and Brian Trippe.