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Karl Waldemar Ziegler (November 26, 1898 – August 12, 1973) was a German chemist who won the Nobel Prize in Chemistry in 1963, with Giulio Natta, for work on polymers. In 1960, Ziegler received the Werner von Siemens Ring, jointly with Otto Bayer and Walter Reppe, for expanding the scientific knowledge of and the technical development of new synthetic materials.

Early Years
Karl Ziegler was born in Helsa near Kassel, Germany to Karl Ziegler, a Lutheran minister, and Luise Rall Ziegler. Throughout his childhood, he was introduced to many notable individuals through his father, including Emil Adolf von Behring, noted for the diphtheria vaccine. Through his adolescence he experimented in a home laboratory, and received academic achievement awards. He studied at the University of Marburg and due to his previous knowledge omitted his first two semesters. He received his Ph.D. in 1920, studying under Karl von Auwers.

Career
During his 26 years at the Max Planck Institute für Kohlenforschung in Mülheim/Ruhr, from 1943 until 1969, Ziegler did most of his work on the Ziegler–Natta catalyst.

Personal Life
In 1922, Ziegler married Maria Kurtz. They had two children, Erhart and Marianna. His daughter, Marianna Ziegler Witte was a doctor of medicine and married a chief physical of a children's hospital (at that time) in the Ruhr. His son, Dr. Erhart Ziegler, was a physicist and patent attorney. In addition to his children, Karl Ziegler has five grandchildren by his daughter, and five by his son.

Ziegler and his wife were great lovers of the arts, particularly paintings. Karl and Maria would present each other with paintings for birthdays, on Christmas, and on anniversaries. No fond of a particular period, their collection is based on paintings they enjoyed.

Maria was an avid gardener, and particularly enjoyed flower paintings by Nolde, Heckel, Kokoschka, and Schmidt-Rottluff. Karl enjoyed pictures of the places that he and his wife called home, including pictures of Halle and the Ruhr valley.

Forty-two images from their shared collection were incorporated into a foundation, bequeathed to the Mülheim Ziegler Art Museum.

Ziegler is recognized for the attitude he took towards research. He was convinced that nothing was a more noble challenge that scientific research and that new knowledge would aid the modern world. In this sense, he saw no distinction between basic research and applied research, as he knew that new insights into natural phenomena would have novel applications in technological society, and both endeavors demand imagination and intellect.

Ziegler also played a major role in the revitalization of chemistry and industry in post-war Germany. An urban high school, Karl-Ziegler-Schule was founded on December 4th, 1974, renaming a previously existing school. The school is located in Mülheim, Germany.

Ziegler died from a heart attack in Mülheim, Germany August 11, 1973.