Congrès International d'Architecture Moderne in the context of "Expressionist architecture"

Charles-Édouard Jeanneret (6 October 1887 – 27 August 1965), known as Le Corbusier, was a Swiss-French architectural designer, painter, urban planner and writer who was one of the pioneers of what is now regarded as modern architecture. He was born in Switzerland to French-speaking Swiss parents, and acquired French nationality by naturalization in 1930. His career spanned five decades, in which he designed buildings in Europe, Japan, India, as well as North and South America. He considered that "the roots of modern architecture are to be found in Viollet-le-Duc."

Dedicated to providing better living conditions for the residents of crowded cities, Le Corbusier was influential in urban planning, and was a founding member of the Congrès International d'Architecture Moderne (CIAM). Le Corbusier prepared the master plan for the city of Chandigarh in India, and contributed specific designs for several buildings there, especially the government buildings. In 2016, seventeen projects by Le Corbusier in seven countries were inscribed in the list of UNESCO World Heritage Sites as The Architectural Work of Le Corbusier, an Outstanding Contribution to the Modern Movement.

Sigfried Giedion (also spelled Siegfried Giedion; 14 April 1888 in Prague – 10 April 1968 in Zürich) was a Bohemian-born Swiss historian and critic of architecture. His ideas and books, Space, Time and Architecture, and Mechanization Takes Command, had an important conceptual influence on the members of the Independent Group at the Institute of Contemporary Arts in the 1950s. Giedion was a pupil of Heinrich Wölfflin. He was the first secretary-general of the Congrès International d'Architecture Moderne (CIAM), and taught at the Massachusetts Institute of Technology, Harvard University, and the ETH-Zurich.

In Space, Time & Architecture (1941), Giedion wrote an influential standard history of modern architecture, while Mechanization Takes Command established a new kind of historiography.

The architecture of Switzerland was influenced by its location astride major trade routes, along with diverse architectural traditions of the four national languages. Romans and later Italians brought their monumental and vernacular architecture north over the Alps, meeting the Germanic and German styles coming south and French influences coming east. Additionally, Swiss mercenary service brought architectural elements from other lands back to Switzerland. All the major styles including ancient Roman, Romanesque, Gothic, Renaissance, Baroque, Neoclassical, Art Nouveau, Modern architecture and Post Modern are well represented throughout the country. The founding of the Congrès International d'Architecture Moderne in La Sarraz and the work of Swiss-born modern architects such as Le Corbusier helped spread Modern architecture throughout the world.

The relative isolation of villages in the Alpine foothills, the Alps and the Jura mountains as well as different languages led to great diversity in the vernacular style. Due to differing traditions, climate and building materials, villages in each region are distinctly different. The Swiss chalet style, which was popular in the 19th century represents only one of a number of traditional designs. Today, due to historic preservation laws and tourism, large and small communities have retained many of their historic core buildings. Since 1972 the Swiss Heritage Society has awarded the Wakker Prize to encourage communities to preserve their architectural heritage.