Bucky Fuller. A proper hero-thinker. Via BFI.org:

Fuller entered Harvard University in 1913, but he was expelled after excessively socializing and missing his midterm exams. Following his expulsion, he worked at a mill in Canada, where he took a strong interest in machinery and learned to modify and improve the manufacturing equipment. Fuller returned to Harvard in the autumn of 1915 but was again dismissed.

From 1917 until 1919, Fuller served in the U.S. Navy, where he demonstrated his aptitude for engineering by inventing a winch for rescue boats that could remove downed airplanes from the water in time to save the lives of pilots.

As a result of the invention, Fuller was nominated to receive officer training at the U.S. Naval Academy, where he further developed his ability to study problems comprehensively. In 1926, when Fuller’s father-in-law, James Monroe Hewlett, developed a new method of producing reinforced concrete buildings, he and Fuller patented the invention, earning Fuller the first of his 25 patents.

In 1927, after the construction company failed, Fuller was unemployed and contemplated suicide, but he had a remarkable realization. Deciding that he had no right to end his own life, he concluded that he had a responsibility to use his experiences and intellect in the service of others. As a consequence, he spent nearly two years as a recluse, deep in contemplation about the universe and how he could best contribute to humanity.