Charles Kettering, also known as "Boss Kettering", was an American inventor and businessman who made significant contributions to the automobile industry and electrical engineering. He developed the first practical electric starter for automobiles, which eliminated the need for a hand crank and made driving much more accessible for the masses. He also invented Freon, a refrigerant still used in air conditioning systems today. Kettering was also known for his research in medical technologies, including cancer treatment and heart disease. Synonyms for Kettering include innovator, pioneer, creator, visionary, and scientist. His legacy continues to inspire inventors and entrepreneurs alike, leaving a lasting impact on the fields of engineering and science.