Gustav Klimt was an Austrian painter born in 1862 who was a leading figure in the Art Nouveau movement. He came from a poor family but was able to attend art school. Klimt is known for his paintings featuring intricate gold designs and mosaic-like patterns. He was inspired by early Christian mosaics and focused on incorporating decorative patterns in his portraits and landscapes. Some of his most famous works include Portrait of Adele Bloch-Bauer I and The Tree of Life.