Hyman was an instructor in modern history at City College (1950–1952); assistant professor of history, Earlham College, 1952–1955; visiting assistant professor of American history, UCLA 1955–1956; associate professor of American history, Arizona State University, 1956–1957; professor of history, UCLA 1963–1968; William P. Hobby Professor of History, Rice University, 1968–2003.
Personal life and death
In 1946, Hyman married Ferne Handelsman, later chief reference librarian at Rice. The couple celebrated 65 years of marriage before her death in 2011.
Harold Hyman died on August 6, 2023, at the age of 99.
Era of the Oath: Northern Loyalty Tests during the Civil War and Reconstruction (University of Pennsylvania Press, 1954, reprinted, Hippocrene Books, 1978).
Equal Justice Under Law: Constitutional Development, 1835-1875 (New American Nation Series) with William Wiecek ISBN978-0-06-014937-6
Quiet Past and Stormy Present?: War Powers in American History (American History Association, 1986), pamphlet
American Singularity: The 1787 Northwest Ordinance, the 1862 Homestead and Morrill Acts, and the 1944 G.I. Bill (University of Georgia Press, 1986). online
The Reconstruction Justice of Salmon P. Chase: In Re Turner and Texas v. White (University Press of Kansas, 1997).
Oleander Odyssey: The Kempners of Galveston, Texas, 1854-1980s (Kenneth E. Montague Series in Oil and Business History)ISBN978-0890964385 (Texas A & M University Press, 1990).
Craftsmanship and Character: A History of the Vinson & Elkins Law Firm of Houston, 1917-1997 (Studies in the Legal History of the South)ISBN978-0820319735 (University of Georgia Press, 1998).
Hyman was editor, contributor, or joint author:
The Radical Republicans and Reconstruction Policy, 1861-1870 (Bobbs- Merrill, 1966), primary sources
New Frontiers of the American Reconstruction (University of Illinois Press, 1966), scholarly essays
(With Leonard W. Levy) Freedom and Reform: Essays in Honor of Henry Steele Commager (Harper, 1967).
(With H. C. Allen and others) Heard 'round the World: The Impact Abroad of the Civil War (Knopf, 1969).
(author of introduction) Carleton Parker, The Casual Laborer and Other Essays (new edition of 1919 original, University of Washington Press, 1972).
(author of introduction, with wife, Ferne Hyman) The Circuit Court Opinions of Salmon Portland Chase (new edition of 1875 original, Da Capo Press, 1972).
(author of introduction) Sidney George Fisher, The Trial of the Constitution (new edition of 1862 original, Da Capo Press, 1972).
(author of introduction) Edward McPherson, The Political History of the United States of America, During the Great Rebellion, 1860-1865 (new edition of 1864 original, Da Capo, 1972).
(With Hans L. Trefousse) Edward McPherson, Handbook of Politics, six volumes, new edition of 1894 original, Da Capo, 1972–73.
(With Hans L. Trefousse) Lincoln's Decision for Emancipation (J. B. Lippincott & Co., 1975) ISBN0-397-47336-2
(With Hans L. Trefousse) Edward McPherson, The Political History of the United States of America during the Period of Reconstruction, new edition of 1871 original, Da Capo, 1973.
(With Kermit L. Hall and Leon V. Sigal) The Constitutional Convention as an Amending Device, American Historical Association/American Political Science Association, 1981.
Editor, with Stuart Bruchey, of the "American Legal and Constitutional History Series," Garland Publishing, 1986–87.
Member of board of editors, Reviews in American History, 1964—, Ulysses S. Grant Association, 1968—, American Journal of Legal History, 1970—, and Journal of American History, 1970–74.
Evaluations
Bodenhamer (2012) says, "The best guide to the constitutional changes brought by the Civil War and Reconstruction is Harold Hyman, A More Perfect Union: The Impact of the Civil War and Reconstruction on the Constitution (1973). Mayer (2001) says Hyman, "wrote the definitive work on loyalty tests throughout American history."