This article explores the importance of developing strong adult education programs within a broader collaborative effort between museum staff and K-12 teachers. Focusing on history museums, the first section discusses the importance of museum visits for K-12 history learning and how we need to reconsider some of the primary purposes for these visits. Part two considers how to develop effective adult education for teachers by exploring the answers to three questions: (1) What is unique about teachers as adult learners? (2) What is unique about learning at museums? (3) How can museum staff and teachers work together to enhance K-12 students' learning?