Jeppesen charts were first introduced in the 1930s by John Jeppesen, a Norwegian-American pilot and entrepreneur. Jeppesen, who was an avid pilot and navigator, recognized the need for more detailed and accurate charts for instrument flying. He developed a system of charts that included critical information about terrain, obstacles, and navigation aids, which became known as Jeppesen charts. Today, Jeppesen charts are widely used by pilots around the world and are considered an essential tool for instrument flying.