Marvin Sloman graduated from the University of Texas School of Law in 1950, where he served on the Board of Editors of the Texas Law Review. He was an original founding member of Carrington, Coleman, Sloman & Blumenthal, where he focused on arguing matters of law and jurisprudence in motions, briefs, and appeals. He was a founder and first president of the Fifth Circuit Bar Association, a longtime member of the American Law Institute, and early chairman of the Appellate Law and Advocacy Section of the State Bar of Texas. He argued twice in the Supreme Court of the United States, winning both times, and appeared frequently before the Supreme Court of Texas and the intermediate courts of appeal. His nomination materials included glowing commentary by jurists and attorneys alike on his integrity and willingness to mentor younger lawyers in the art of advocacy and the power of preparation. Those materials included an essay, written by Bryan Garner and entitled Finding Good Writing Mentors – the focus of which was Marvin Sloman.