Informal learning experiences can provide valuable visitor-to-staff interactions that require skilled staff--often volunteers--to adjust to the needs of each visitor group. These experiences are often less regimented to provide increased flexibility for both the museum and the volunteer, allowing for more diversity of volunteer support. This article discusses the literature on education volunteers in a museum setting with a focus on how to effectively train and retain quality gallery-based volunteers. Based on the literature, we highlight five hallmarks of a successful education volunteer program: shared vision, communities of practice, experiential learning, continuing education, and evaluation.