German-born American civil engineer. He is famous for his wire rope suspension bridge designs, in particular, the design of the Brooklyn Bridge.
John August Roebling was a brilliant engineer, inventor and entrepreneur. He designed bridges, buildings and machines, kept his own financial journals, and in his spare time studied and wrote about science and philosophy and played the violin and piano. In his lifetime he became the world’s greatest suspension bridge engineer and started a manufacturing business that prospered through four generations.
At the Royal Building Academy in Berlin, he studied architecture and engineering and became fascinated with suspension bridges. During his required three years of public service building roads, he proposed building some, but state officials rejected his plans.
Seeking better opportunities, Johann immigrated to America at age 25 with his brother Karl and other Germans. They settled in western Pennsylvania and founded a farming village they called Saxonburg. Johann married the village tailor’s daughter, Johanna Herting, John Roebling and Johanna Herting had nine children.
In 1836 Johann became an American citizen that year with the Anglicized name John A. Roebling.
John started doing engineering work for the Pennsylvania Canal system, which led to a job surveying for a railroad route over the Allegheny Mountains. When he saw the limitations of the hemp ropes that were used to haul canal boats on inclined planes over the mountains, he made an experimental rope of twisted wires, a technique he read about in an article by a German mine supervisor. He installed this rope in 1841 and its success launched the wire rope manufacturing business that made him rich.
In 1844 he had his first chance to build a suspension bridge in Pittsburgh, and its success launched his bridge engineering career, which made him famous but eventually cost him his life.
While surveying the site of the Brooklyn tower for the Brooklyn Bridge, the tip of Roebling’s right foot was crushed by a docking boat. After his toes were amputated, Roebling was diagnosed with tetanus and developed lockjaw. He suffered severe seizures and periodically lapsed into a coma before dying in the early morning hours of 22 July 1869 in Brooklyn Heights, New York.

Link to Wikipedia biography