Jeffrey M. Keefer, Ph.D., is the Director of Training and Knowledge Management in New York City for The Trust for Public Land, a national nonprofit organization that creates parks and protects land for people, ensuring healthy, livable communities for generations to come. He is passionate about research and practice in social and networked learning, doctoral education and researcher development, threshold concepts in higher education, liminality in learning experiences, and actor-network theory.

Jeffrey is an Adjunct Assistant Professor at New York University in the Management and Systems / Human Resource Management & Development graduate programs and an Adjunct Professor at Pace University on the Doctor of Nursing Practice faculty. He holds a Ph.D. in Educational Research.