January 30

Born in Brooklyn in 1862, Doubleday began his career in publishing as an apprentice to McClure's magazine. In 1897, he co-founded Doubleday & McClure Company, later merging to form Doubleday, Page & Company. Under his leadership, the firm published authors like Rudyard Kipling and Winston Churchill. Doubleday expanded into book clubs and international markets, shaping modern publishing. His vision established a literary empire that endured under his family's stewardship for decades.

Ferdinand Porsche (1875-1951) was an Austrian-German automotive engineer and entrepreneur. He began his career designing electric vehicles and gained fame for his engineering work at Austro-Daimler and Mercedes. In the 1930s, he developed the Volkswagen Beetle at the request of the German government. In 1931, he founded the Porsche company in Stuttgart, focusing on high-performance sports cars. Under his guidance, the company produced racing models that achieved international success. His innovative designs influenced automotive engineering for decades. Ferdinand Porsche passed away on January 30, 1951, leaving a global legacy in car design and motorsports.

Ernst Heinkel (1888-1958) was a German engineer and aircraft manufacturer. He founded the Heinkel Aircraft Company in 1922, initially focusing on seaplanes and mail planes. Under his direction, the company developed innovative designs including the He 111 bomber and He 178, the world's first jet-powered aircraft. Heinkel's work helped lay the foundation for modern turbojet technology. After World War II, he continued to contribute to aviation research and design in West Germany. His pioneering achievements significantly influenced military and civilian aviation. He died on January 30, 1958, remembered as a leading figure in aerospace engineering.