Center for Population Economics at the Booth School of Business. Fogel researched and wrote on numerous fields in his career, including not only economic history but also demographics, physiology, sociology of the family, nutrition, China's economic development, philosophy of science, and other related fields. He integrated insights from such diverse fields in his attempts to explain important historical phenomena such as the dramatic fall in mortality rates from the 18th to the 20th century. His former colleague Deirdre McCloskey credits Fogel with "reuniting economics and history". He advised many students who went on to become prominent economic historians, so that many economic historians in the United States trace their academic lineage to him. Fogel was elected to the American Academy of Arts and Sciences in 1972, the National Academy of Sciences in 1973, and the American Philosophical Society in 2000. Fogel married Enid Cassandra Morgan, an African-American woman, in 1949 and had two children. The couple faced significant difficulties at the time due to anti-miscegenation laws and prevalent sentiments against interracial marriages. He died on June 11, 2013, in Oak Lawn, Illinois, of a short illness, aged 86. Contributions Cliometrics and Railroads and American Economic Growth Fogel's first major study involving cliometrics was Railroads and American Economic Growth: Essays in Econometric History (1964). This tract sought to quantify the railroads' contribution to U.S. economic growth in the 19th century. Its argument and method were each rebuttals to a long line of non-numeric historical arguments that had ascribed much to expansionary effect to railroads without rigorous reference to economic data. Fogel argued against these previous historical arguments to show that onset of the railroad was not indispensable to the American economy. Examining the transportation of agricultural goods, Fogel compared the 1890 economy to a hypothetical 1890 economy in which transportation infrastructure was limited to wagons, canals, and natural waterways. Fogel pointed out that the absence of railroads would have substantially increased transportation costs from farms to primary markets, particularly in the Midwest, and changed the geographic location of agricultural production. Despite this consideration, the overall increase in transportation costs, i.e., the "social savings" attributable to railroads, was small – about 2.7% of 1890 GNP. The potential for substitute technologies, such as a more extensive canal system or improved roads, would have further lowered the importance of railroads. The conclusion that railroads were not indispensable to economic development made a controversial name