Charles A. Zimmermann was an American engineer and inventor known for his contributions to the field of electrical engineering. He is particularly recognized for his work on the development of the electronic oscillator, which is essential in various electronic devices, including radios and televisions. His innovations helped advance communication technology in the early 20th century. In addition to his work on oscillators, Zimmermann also contributed to the design of telecommunication systems and held several patents throughout his career. His efforts played a significant role in shaping modern electronics, making him a notable figure in the history of engineering.