Marcia Peterson Sward (February 1, 1939 – September 21, 2008) was an American mathematician and nonprofit organization administrator.
Her PhD thesis was written under Edward J. Scott and titled The Mixed Boundary Value Problem Along the Line of Parabolicity for a Certain Class of Hyperbolic Partial Differential Equations.
She stated in an interview with Association Management magazine that one reason was a low threshold of boredom, but also emphasized the need to stretch one's skills.
During her time there she worked to get the ANS Nature Preschool started, began the GreenKids program (an outreach program that sends naturalists to Montgomery County, Maryland, schools), and helped start the Loudoun Environmental Stewardship Alliance.
She was influenced by Richard Louv's book Last Child in the Woods to work on projects that made a difference in the lives of children.