A native of Wyoming, Aynn earned a BA in international studies from the University of Wyoming and an MA in Latin American and Caribbean history from the Universidad Nacional Autónoma de Nicaragua (UNAN), Managua. She is a doctoral candidate at the University of Zulia, Venezuela, and is currently completing her dissertation on Central American ecofeminism. Aynn was appointed as academic dean for Latin America and the Caribbean in September 2016. Prior to this position, she served as academic director for SIT Study Abroad in Nicaragua since 1999. She is a member of the Latin American Studies Association and participates in the Central American Studies Section of LASA as well as in the Central American Historians Association.
As a graduate student, Aynn went to Nicaragua with a social justice organization called Witness for Peace. She became a long-term volunteer with Witness for Peace, and from 1985-87 she drove an ambulance in the war zone and worked with a rural Catholic parish in the northern mountains of Nicaragua. From 1987-93, she was coordinator of a small development organization, Proyecto Cristo Rey, working with 800 war refugee families in 16 resettlement communities in Matagalpa and what is now known as the North and South Autonomous Caribbean Coast Regions. This project was awarded the Institute for Policy Studies Letelier-Moffit Memorial Human Rights Award in 1991.