Final answer:
McKim, Mead, and White were architects known for their neoclassical designs. Their notable commissions include the Boston Public Library and the Washington Square Arch.
Step-by-step explanation:
McKim, Mead, and White were architects who were known for their works in the late 19th and early 20th centuries. They were part of the Beaux-Arts architectural movement and were known for their neoclassical designs. Some of their notable commissions include the Boston Public Library, the Washington Square Arch in New York, and the Pennsylvania Station in New York.