This document provides an overview of the history and development of modern dance. It discusses early pioneers like Isadora Duncan who incorporated natural and improvised movements in the late 19th/early 20th century. Figures like Ruth St. Denis and Ted Shawn then established the first modern dance school, Denishawn, in the US in the early 1900s. The document also outlines the contributions of Martha Graham, Doris Humphrey, and others who further developed techniques like contraction and release in the 1920s-30s and helped establish modern dance as a serious art form focused on emotion and personal expression over entertainment.