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Heinrich (Henry) Hackfeld was born in Almsloh, a village in the parish of Ganderkesee, in the Grand Duchy of Oldenburg. He eventually became part of the Bremish mercantile elite, but was atypical in that he came from a humble background. His firm, H. Hackfeld & Co. of Honolulu, was one of a number of German mercantile businesses founded in Melanesia and Polynesia during the nineteenth century. Initially the main focus of the firm’s business was both indirect and direct involvement in the North Pacific whaling industry. After the demise of this industry, at the beginning of the 1870s, the firm shifted its focus to another part of its business, the provision of factoring services to the Hawaiian sugar industry. By the time of the incorporation of Hawaii as a United States Territory in 1900 the firm was one of a small group of sugar factors that dominated the islands’ economy.

Adam Hammer was a German physician who immigrated to St. Louis, after having participated in the uprising in Baden. Soon after his arrival in the United States he became aware of the deficiencies in the American medical education system. He determined that the most effective remedy for the situation would be to carry out a comprehensive reform of the medical sector using the educational and medical practices of Germany as a model. Hammer’s entrepreneurial significance is found in his contributions to society as a social entrepreneur in the worlds of academia and public health, rather than as a profitable commercial entrepreneur.

Peter Hasenclever was a German-born international businessman active from approximately 1733 until 1792. From 1764 to 1770, he resided in the British colonies of New York and New Jersey, where he established an ultimately unsuccessful transatlantic enterprise to produce, transport, and market iron and steel.

Jacob Hasslacher has been counted among the American chemical industry’s “founding fathers.” The manufacture and sale of specialty chemicals was more advanced in his native country than in his adopted one, and his firm, the Roessler & Hasslacher Chemical Company, benefited from its German connections during most of the period in which it was led by Hasslacher.

Charles August Heckscher hailed from an influential, well-to-do, and sophisticated Jewish family of merchant-bankers in Altona and the nearby, independent city-state of Hamburg. In 1829 he emigrated from Hamburg to the United States to become a successful merchant and entrepreneur. He acquired wealth by opening a trading house in New York City and later used his personal capital to invest in anthracite coal mining and transportation operations in eastern Pennsylvania. By the time of his death shortly after the end of the Civil War, he was one of the leading colliery operators in the nation.

John Gund and Gottlieb Heileman found success by selling beer to their fellow immigrants. Over time, this success translated into greater business opportunities. Though neither firm exists today, both left a legacy that is felt within the local La Crosse community and the national brewing industry.

Born in a small town in Bavaria, Isaias Wolf Hellman was one of a number of German-Jewish immigrants whose entrepreneurial and philanthropic efforts helped transform Los Angeles and San Francisco from rough mining camps into two of America’s leading urban centers.

The German doctor, homeopathist, author and philanthropist Constantine Hering was born at the dawn of a new century, on January 1, 1800, in Oschatz, Saxony, and played a crucial role in the development of the medical sector in the United States, in particular regarding the introduction of the innovative medical treatment called homeopathy.

Between the end of the Gilded Age and the beginning of the Progressive Era, the name August “Garry” Herrmann was known throughout the United States. Herrmann was a man who had a humble beginning; he made millions of dollars during his lifetime through his political involvement and partial ownership of the Cincinnati Reds. As a local politician he served as the right-hand man to one of the most powerful political bosses of his era, George B. Cox of Cincinnati. As president of the Cincinnati Reds and chairman of baseball’s National Commission, he helped to usher in the modern World Series and is one of the most important early major league baseball executives.

During the first half of the twentieth century, Christian Heurich, Sr., was the most prominent brewer in Washington, DC. He was also regarded as an elder statesman of the American brewing industry as a whole. Born in 1842 in the Duchy of Saxe-Meiningen, Heurich immigrated to the U.S. in 1866 to start his own brewery.

German immigrant Frederick A. Hihn arrived in San Francisco as part of the Gold Rush and later amassed vast landholdings in Santa Cruz County. He spent much of his life developing property around existing towns and creating new vacation communities along Monterey Bay.

See Max Hirsch

Max Hirsch and his son Harold Hirsch were responsible for building one of Portland’s most famous businesses and helping to create a sportswear industry. Max Hirsch was a first-generation German Jewish immigrant to Portland who in 1907 purchased Willamette Tent & Awning from a Portland businessman and turned it into the Hirsch-Weis Company. Building on the success of his father's company, Harold grew his skiwear line into White Stag, one of the largest skiwear companies in the world.

In 1857, Matthias Hohner established a harmonica workshop that would become the world-leading producer of this small musical instrument. Founded in Trossingen, a small town in rural southwest Germany, the company soon expanded into the American market through Matthias Hohner's son Hans, who was partially educated in the United States and supervised the first foreign branch of the company, founded in New York in 1901. Hans' nephew, Matthias (Matthew) Hohner, later took over the American branch from Hans in 1927.

Herman Hollerith was the inventor of the first patented mechanized punched-card system, the technological foundation for the computing industry. He established a company to pursue the innovation based on census processing in the United States and several foreign countries, including Russia, Norway, and France. He licensed the technology to other firms in Austria-Hungary, Great Britain, and Germany. Hollerith revolutionized the technology used for general statistics and accounts processing by private businesses as well. He eventually sold his company to a conglomerate in 1911 which eventually renamed itself the International Business Machines Corporation (IBM) in 1924. Hollerith’s inventions and innovations provided the business foundation for IBM’s prosperity throughout its early years.

George Albert Hormel, the son of German immigrants, used the knowledge, skills, and values he learned from his family to succeed as an independent meatpacker in an industry dominated by corporate giants.

See Jacob Hasslacher