Charles B. Macdonald was an influential American golf course designer, known for his innovative approach to course architecture. Born in 1855, he played a significant role in shaping the game of golf in the United States during the late 19th and early 20th centuries. His designs often emphasized the natural landscape, making the most of the terrain's features. Macdonald is best known for creating the first 18-hole golf course in the U.S., located at Chicago Golf Club. He was also a founding member of the American Society of Golf Course Architects, which helped establish standards in golf course design. His legacy continues to impact the sport today.