John J. O'Neill

John J. O'Neill (1889-1953) was an American journalist and science editor best known for his close friendship with Nikola Tesla and for authoring the influential biography Prodigal Genius: The Life of Nikola Tesla (1944). As the longtime science editor of the New York Herald Tribune, O'Neill was a Pulitzer Prize-winning reporter (1937) who specialized in making complex scientific topics accessible to the general public. His professional relationship with Tesla evolved into a personal friendship, giving him unique access to the inventor during the final decades of Tesla’s life.

O'Neill’s Prodigal Genius remains one of the earliest and most widely read full-length biographies of Tesla. Drawing on personal conversations, correspondence, and direct observation, the book helped preserve many details of Tesla’s life and personality that might otherwise have been lost. While later scholars have noted some romanticized elements and inaccuracies typical of mid-20th-century popular science writing, O'Neill’s work played a major role in keeping Tesla’s legacy alive during a period when the inventor was largely forgotten by the broader public. O'Neill’s writings, including numerous articles for the Herald Tribune, frequently highlighted Tesla’s contributions to alternating current, wireless technology, and high-frequency phenomena.