Pierre Koenig was an influential American architect known for his modernist designs. Born on October 17, 1925, he gained recognition for his work in the mid-20th century, particularly in Southern California. His most famous projects include the Case Study House No. 21 and the Case Study House No. 22, which exemplified the principles of open space and integration with nature. Koenig's architectural style emphasized simplicity and functionality, often using steel and glass to create structures that blended with their surroundings. He was a key figure in the Case Study House Program, which aimed to provide affordable housing solutions post-World War II. His contributions have left a lasting impact on modern architecture.