Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hans K. Ziegler (born in 1911 in Munich, Germany; died December 11, 1999) was a pioneer in the field of communication satellites and the use of photovoltaic solar cells as a power source for satellites. Hans Ziegler was born in Munich, Germany. There, he studied at the Technische Hochschule, which is today the Technische Universität München (TUM), and began his career as Wissenschaftlicher Assistant (Scientific Assistant), which corresponds to a "professor" at US universities. Following that, he was a researcher in German industry for ten years. During the Second World War, he worked for the company Rosental Selb in Bavaria on high tension porcelain.