Nikola Tesla — Inventor and Electrical Engineer

Nikola Tesla is born in Smiljan, a village in the Military Frontier of the Austrian Empire (modern-day Croatia), to Serbian parents. His father Milutin is an Eastern Orthodox priest and his mother Djuka is an inventor of household tools who never received formal education but possesses a remarkable memory, which Tesla credits for his own abilities.

Tesla enrolls at the Imperial-Royal Technical College in Graz on a Military Frontier scholarship. He passes nine exams (nearly twice as many as required) and receives a letter of commendation from the dean. However, by his third year he is failing in school and leaves in December 1878 without graduating, having developed a fascination with electricity.

While walking in Budapest, Tesla experiences a flash of insight and conceives the principle of the rotating magnetic field — the foundation of the AC induction motor. He later describes this moment as a vision in which he "solved the problem of the AC motor." He spends the next several years refining this concept.

Tesla arrives in New York City with four cents in his pocket and a letter of recommendation from Charles Batchelor to Thomas Edison: "I know two great men and you are one of them; this young man is the other." He works briefly at the Edison Machine Works repairing dynamos and improving generators, but the relationship sours over a dispute about unpaid bonuses.

After a period of hardship including ditch-digging, Tesla meets Western Union superintendent Alfred S. Brown and attorney Charles Peck. They form the Tesla Electric Company, providing Tesla with laboratory space at 89 Liberty Street in Manhattan. Here, Tesla develops his AC induction motor and polyphase power system.

Tesla patents his alternating current induction motor — a self-starting design without a commutator that generates a rotating magnetic field. He demonstrates the motor at the American Institute of Electrical Engineers. George Westinghouse licenses the patent and hires Tesla as a consultant, paying 60,000 in cash and stock plus royalties.

Tesla invents the Tesla coil, a resonant transformer circuit capable of producing extremely high-voltage, high-frequency alternating current electricity. The Tesla coil becomes a fundamental component of radio technology and remains a staple of science demonstrations today.

Westinghouse wins the contract to illuminate the World's Columbian Exposition in Chicago, using Tesla's AC power system. The fair lights up with 100,000 incandescent lamps, demonstrating the superiority of AC power. This triumph validates Tesla's polyphase system and leads to the award of the contract for the Niagara Falls power project.

Tesla conducts experiments with X-ray imaging (which he calls "shadowgraphs") using his high-voltage vacuum tubes. He produces some of the earliest X-ray images, including a photograph of his own foot showing the bones. However, Tesla's work is overshadowed by Wilhelm Roentgen's public announcement later that year.

A devastating fire destroys Tesla's South Fifth Avenue laboratory in New York City, obliterating years of research, notes, models, and prototypes. Tesla loses irreplaceable work on mechanical oscillators, electrical discharge tubes, and early X-ray experiments. He describes the loss as "very disheartening."

At Madison Square Garden, Tesla demonstrates the world's first radio-controlled (teleautomaton) vessel — a small boat that can be steered, turned, and lit up via wireless signals. The US Navy shows little interest in the invention, which Tesla envisions as the basis for wireless torpedoes. The demonstration is considered a precursor to modern robotics and drone technology.

Tesla moves to Colorado Springs to conduct high-voltage, high-frequency electricity experiments. He builds a massive Tesla coil that produces 12 million volts of electricity, creating 135-foot-long artificial lightning bolts. The experiments provide crucial data for his theories on wireless power transmission and earth resonance.

Backed by financier J.P. Morgan, Tesla begins construction of the Wardenclyffe Tower on Long Island — an ambitious facility intended to transmit wireless power and communications across the Atlantic. However, when Morgan withdraws funding (partly due to Guglielmo Marconi's successful radio transmission), the project stalls. Tesla is forced to abandon the tower in 1906, and it is demolished in 1917.

Despite his long-standing rivalry with Thomas Edison, the American Institute of Electrical Engineers awards Tesla the Edison Medal. Tesla is initially reluctant to accept but eventually does so. The medal recognizes his contributions to the development of the polyphase AC power system.

Nikola Tesla dies alone in Room 3327 of the New Yorker Hotel at the age of 86. Despite his monumental contributions to modern civilization, he dies in relative obscurity and debt. His body is cremated and his ashes are later placed in the Nikola Tesla Museum in Belgrade, Serbia. His funeral is attended by over 2,000 people.

The General Conference on Weights and Measures names the International System of Units (SI) measurement of magnetic flux density the "tesla" (symbol T) in his honor. This recognition places Tesla among a small group of scientists whose names have become units of measurement.