Who is the inventor of modern helicopters?

The invention of modern helicopters is primarily attributed to Igor Sikorsky, who developed the first successful single-rotor helicopter, the VS-300, in 1939. Sikorsky's design included a tail rotor for stability and control, which became a standard feature in later helicopters. His innovations laid the groundwork for the development of modern rotary-wing aircraft, making him a key figure in helicopter aviation history.