This document provides an overview of the history and key figures in modern architecture, including Louis Sullivan who is considered the "Father of modernism and skyscrapers". It discusses his influential buildings like the Auditorium Building and Guaranty Building. It also covers the International Style popularized in the 20th century by figures like Frank Lloyd Wright, Philip Johnson and Mies van der Rohe. Additionally, it outlines the emergence of Postmodernism, High-Tech Architecture, Deconstructivism and some of their notable exemplar buildings.