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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.