Thurgood Marshall (July 2, 1908 – January 24, 1993) was an American jurist and the first African American to serve on the Supreme Court of the United States. Prior to becoming a judge, he was a lawyer who was best remembered for his high success rate in arguing before the Supreme Court and for the victory in Brown v. Board of Education.

Marshall was born in Baltimore, Maryland, on July 2, 1908. His original name was Thoroughgood but he shortened it to Thurgood in second grade. His father, William Marshall, instilled in him an appreciation for the Constitution of the United States and the rule of law. Additionally, as a child, he was punished for his school misbehavior by being forced to read the Constitution, which he later said piqued his interest in the document. Marshall was a descendant of slaves.

Marshall was married twice; to Vivian "Buster" Burey from 1929 until her death in February 1955 and to Cecilia Suyat from December 1955 until his own death in 1993. He had two sons from his second marriage; Thurgood Marshall, Jr., who is a former top aide to President Bill Clinton, and John W. Marshall, who is a former United States Marshals Service Director and since 2002 has served as Virginia Secretary of Public Safety under Governors Mark Warner and Tim Kaine.

Marshall received his law degree from Howard in 1933, and set up a private practice in Baltimore. The following year, he began working with the Baltimore NAACP. He won his first major civil rights case, Murray v. Pearson, 169 Md. 478 (1936). This involved the first attempt to chip away at Plessy v. Ferguson, a plan created by his co-counsel on the case Charles Hamilton Houston. Marshall represented Donald Gaines Murray, a black Amherst College graduate with excellent credentials who had been denied admission to the University of Maryland Law School because of its separate but equal policies. This policy required black students to accept one of three options, attend: Morgan College, the Princess Anne Academy, or out-of-state black institutions. In 1935, Thurgood Marshall argued the case for Murray, showing that neither of the in-state institutions offered a law school and that such schools were entirely unequal to the University of Maryland. Marshall and Houston expected to lose and intended to appeal to the federal courts. However, the Maryland Court of Appeals ruled against the state of Maryland and its Attorney General, who represented the University of Maryland, stating "Compliance with the Constitution cannot be deferred at the will of the state. Whatever system is adopted for legal education now must furnish equality of treatment now". While it was a moral victory, the ruling had no real authority outside the state of Maryland.

Marshall won his very first U.S. Supreme Court case, Chambers v. Florida, 309 U.S. 227 (1940). At the age of 32, that same year, he was appointed Chief Counsel for the NAACP. He argued many other cases before the Supreme Court, most of them successfully, including Smith v. Allwright, 321 U.S. 649 (1944); Shelley v. Kraemer, 334 U.S. 1 (1948); Sweatt v. Painter, 339 U.S. 629 (1950); and McLaurin v. Oklahoma State Regents, 339 U.S. 637 (1950). His most famous case as a lawyer was Brown v. Board of Education of Topeka, 347 U.S. 483 (1954), the case in which the Supreme Court ruled that "separate but equal" public education was unconstitutional because it could never be truly equal. In total, Marshall won 29 out of the 32 cases he argued before the Supreme Court.

During the 1950s, Thurgood Marshall developed a friendly relationship with J. Edgar Hoover, the director the Federal Bureau of Investigation. In 1956, for example, he privately praised Hoover's campaign to discredit T.R.M. Howard, a maverick civil rights leader from Mississippi. During a national speaking tour, Howard had criticized the FBI's failure to seriously investigate cases such as the 1955 murders of George W. Lee and Emmett Till. Ironically, two years earlier Howard had arranged for Marshall to deliver a well-received speech at a rally of his Regional Council of Negro Leadership in Mound Bayou, Mississippi only days before the Brown decision.

President John F. Kennedy appointed Marshall to the United States Court of Appeals for the Second Circuit in 1961. A group of Democratic Party Senators led by Mississippi's James Eastland held up his confirmation, so he served for the first several months under a recess appointment. Marshall remained on that court until 1965, when President Lyndon B. Johnson appointed him Solicitor General.

On June 13, 1967, President Johnson appointed Marshall to the Supreme Court following the retirement of Justice Tom C. Clark, saying that this was "the right thing to do, the right time to do it, the right man and the right place." He was the 96th person to hold the position, and the first African-American. President Johnson confidently predicted to one biographer, Doris Kearns Goodwin, that a lot of black baby boys would be named "Thurgood" in honor of this choice (in fact, Kearns's research of birth records in New York and Boston indicates that Johnson's prophecy did not come true).

Marshall served on the Court for the next twenty-four years, compiling a liberal record that included strong support for Constitutional protection of individual rights, especially the rights of criminal suspects against the government. His most frequent ally on the Court (indeed, the pair rarely voted at odds) was Justice William Brennan, who consistently joined him in supporting abortion rights and opposing the death penalty. Brennan and Marshall concluded in Furman v. Georgia that the death penalty was, in all circumstances, unconstitutional, and never accepted the legitimacy of Gregg v. Georgia, which ruled four years later that the death penalty was constitutional in some circumstances. Thereafter, Brennan or Marshall dissented from every denial of certiorari in a capital case and from every decision upholding a sentence of death. See Woodward, The Brethren; Lazarus, Closed Chambers.

Although he is best remembered for his jurisprudence in the fields of civil rights and criminal procedure, Marshall made significant contributions to other areas of the law as well. In Teamsters v. Terry he held that the Seventh Amendment entitled the plaintiff to a jury trial in a suit against a labor union for breach of duty of fair representation. In TSC Industries, Inc. v. Northway, Inc. he articulated a formulation for the standard of materiality in United States securities law that is still applied and used today. In Cottage Savings Association v. Commissioner of Internal Revenue, he weighed in on the income tax consequences of the Savings and Loan crisis, permitting a savings and loan association to deduct a loss from an exchange of mortgage participation interests.

Among his many law clerks were Chief Judge Douglas Ginsburg of the D.C. Circuit Court of Appeals, well-known law professors Cass Sunstein, Eben Moglen, Susan Low Bloch, and Mark Tushnet, Dean Richard Revesz of New York University School of Law, and Dean Elena Kagan of Harvard Law School.

Marshall died of heart failure at the age of 84. He died at the National Naval Medical Center in Bethesda, Maryland, at 2:58 p.m. on January 24, 1993. He was buried in Arlington National Cemetery. He was survived by his second wife and their two sons. Marshall left all of his personal papers and notes to the Library of Congress. The Librarian of Congress opened Marshall's papers for immediate use by scholars, journalists and the public, insisting that this was Marshall's intent. The Marshall family and several of his close associates disputed this claim. There are numerous memorials to Justice Marshall. One is near the Maryland State House. The primary office building for the federal court system, located on Capitol Hill in Washington D.C., is named in honor of Justice Marshall and also contains a statue of him in the atrium. The major airport serving Baltimore and the Maryland suburbs of Washington, DC, was renamed the Baltimore-Washington International Thurgood Marshall Airport on October 1, 2005.