John McComb Jr. was an American architect known for his contributions to the design of buildings in the 19th century. He was born in 1800 and became prominent in the New York area, where he created various structures that showcased his architectural style. His work often reflected the trends of the time, including elements of Greek Revival and Italianate architecture. McComb is perhaps best known for designing the New York City Hall and several other significant buildings. His designs were characterized by their attention to detail and functionality, making a lasting impact on the architectural landscape of New York City. He passed away in 1858, leaving behind a legacy of influential works.