Oscar Koelliker was a Swiss painter who is known for his association with the Impressionist art movement and his close friendship with Claude Monet. Koelliker was born in Zurich, Switzerland, and studied art in Munich and Paris. He was deeply influenced by the Impressionists, particularly Monet, and his painting style reflected their emphasis on capturing the effects of light and color in nature. Koelliker's works are characterized by loose brushwork, vibrant colors, and an emphasis on the play of light and shadow. Koelliker's friendship with Monet began in 1913, when Koelliker visited Monet's home in Giverny, France. The two artists quickly became close friends, and Koelliker began to spend more and more time with Monet in Giverny. The influence of the great Impressionist artist is evident throughout Koelliker's work, particularly in his landscapes and garden scenes. Koelliker's connection to the Impressionist movement was strengthened by his participation in the Salon des Indépendants, an annual exhibition in Paris that showcased the work of artists who rejected the traditional academic style of painting. Koelliker exhibited his work at the Salon from 1910 to 1939, and his paintings were well received by critics and collectors. Despite his association with the Impressionists, Koelliker's work also shows the influence of other modernist styles, such as Fauvism and Cubism. His use of bold, expressive brushstrokes and vivid colors reflects these influences, and his work is often seen as a bridge between the Impressionist and Modernist movements. Koelliker's work therefore stands as a bridge between Impressionism and Modernism and marks an important contribution to the development of modern art.