Leonardo da Vinci—
It is difficult to conceive of a man who better exemplifies the true inventor than Leonardo di ser Piero da Vinci. He represents the unique amalgamation of the artist and scientist. He is as famous among the artists of the world for his Mona Lisa as what he is among scientists for his myriad of inventions, ranging from robots and weapons to bridges and flying machines. There is even evidence that he invented the mechanical calculator. What he lacked in formal training he more than made up for in innovation, intense concentration and devotion to detail.
Thomas Alva Edison—
Edison holds 1,093 United States patents in his own name. These cover a wide range of subjects, including the generation of electricity, recorded music, motion pictures, and telecommunications. Where Da Vinci personified the artist-inventor, Edison personified the businessman-inventor. While his inventions included the stock ticker and mechanical vote recorder, it is his incandescent electric light bulb that every school child knows about.
On 26 February 2008 Australian inventor, scientist, and serial entrepreneur Kia Silverbrook became the world’s most prolific inventor as gauged by patents awarded. At that point, Silverbrook had more than 3,900 granted U.S. utility patents – more than Apple and Google combined. Internationally, Silverbrook had more than 8,900 utility patents. While his inventions ranged across a number of fields, inkjet printing was the largest category.