This workshop will cover fundamental concepts for creating effective data visualization and will introduce tools and techniques for visualizing data using R. We will review fundamental concepts for visually displaying quantitative information, such as using series of small multiples, avoiding "chart-junk," and maximizing the data-ink ratio. After briefly covering data visualization using base R graphics, we will introduce the ggplot2 package for advanced high-dimensional visualization. We will cover the grammar of graphics (geoms, aesthetics, stats, and faceting), and using ggplot2 to create plots layer-by-layer. Upon completing this workshop, participants will be able to use ggplot2 to explore a high-dimensional dataset by faceting and scaling scatter plots in small multiples.