Rachel Fletcher was born in Baltimore, Maryland, in 1947 and was raised there. She began her career in lighting and stage design for the theater with degrees from Hofstra University (B.A. in theater arts), SUNY Albany (M.A. in dramatic literature), and Humboldt State University (M.F.A. in lighting/stage design). She has been a faculty member of the New York School of Interior Design since 1996 and a contributing editor to the Nexus Network Journal since 2005. Her professional work designing theatrical spaces led to an interest in the principles of geometric proportion and harmony as a design system, including time as a geometer and teacher of geometry and proportion for school-age children and adult professionals and at dozens of universities, museums, and institutions in the United States and Europe. In this capacity, she received an International Center for Jefferson Studies Fellowship Award from the Thomas Jefferson Foundation to study geometric proportions in Jefferson's architectural works. Fletcher was the creator/curator of the museum exhibits "Infinite Measure," "Design by Nature," and "Harmony by Design: The Golden Mean" and the author of the latter's exhibit catalog. As a community activist, she is the founding director of the Housatonic River Walk in her home town of Great Barrington, Massachusetts, which was designated a National Recreation Trail by the National Park Service in 2009, and the co-director of the Upper Housatonic Valley African-American Heritage Trail. For her significant contributions to conservation and civic improvements, she has received an Environmental Merit Award from the U.S. Environmental Protection Agency, citations from the Garden Club of America, and the National Urban Hometown River Award in Grassroots Activism from American Rivers, among other honors.