Johann Ernst Juncken was born in Germany and worked as a needlemaker. He married Christina Dorothea and they lived together in Durlach, Germany. They had three children: Johann Heinrich (later Henry), Christina Dorothea, and Christina Barbara. Johann Ernst Juncken and his family migrated to the United States in approximately 1753, where they settled in Philadelphia. His birth and death dates are unknown.

Henry Juncken was a hat maker and a British loyalist who lived in Philadelphia and Quebec City. He was born Johann Heinrich Juncken on 11 April 1735 in Durlach, Germany, son of Johann Ernst Juncken and Christina Dorothea Juncken. Henry moved with his family to Philadelphia in approximately 1753, where they settled. He married Anna Barbara sometime afterwards. Henry was imprisoned for 10 days in 1777 for harboring loyalist sympathies, and fled with his wife to New York when the British evacuated Philadelphia. He migrated to England in 1781, and then settled permanently in Quebec City in approximately 1783. There, he established himself as a hat merchant, a business that he eventually shared with his nephews William Hall and Johann Ernst Rees. Henry died in Quebec City in 1802, after which his wife moved with their nephew Johann Ernst Rees back to Philadelphia.

Christina Dorothea Juncken was born in Germany on 6 September 1699. She married needlemaker Johann Ernst Juncken and they lived together in Durlach, Germany. They had three children: Johann Heinrich (later Henry), Christina Dorothea, and Christina Barbara. Christina Dorothea and her family migrated to the United States in approximately 1753, where they settled in Philadelphia. She died in 1782.

Alfred John Jukes-Browne was born on April 16, 1851, in Penn, Staffordshire, England.
He was a British paleontologist, stratigrapher, and geological surveyor. He was educated at Highgate School (1863–1868) and at St. John's College, Cambridge (B.A., 1874). In 1874, he became an assistant at the Geological Survey of Great Britain and was chiefly occupied in mapping parts of Suffolk, Cambridge, Rutland, and Lincoln up to 1883 and then entrusted with the preparation of a monograph on the British Upper Cretaceous rocks. He became a Fellow of the Geological Society in 1874 and won its Murchison medal in 1901. In 1909, he was elected a Fellow of the Royal Society. He contributed numerous papers to geological periodicals and wrote several books, e.g., “The Student's Handbook of Historical Geology" (1886) and "Building of the British Isles” (1911). He retired from the Geological Survey in 1902 on account of ill-health.
In 1881, he married Emma Jessie Smith (1858–1892). He died on August 14, 1914, in Newton Abbot, Devon, England.