Innovation often happens at the margin. For the past 5 years, in the academic equivalent of an ecotone, Aquinas College in Grand Rapids, Michigan has built and continues to refine offerings in its 4-year Bachelor of Science degree in Sustainable Business. Emerging out of the demands of a rapidly changing business world and the sustainable business movement, this degree program integrates and spans across disciplines. As the country's first undergraduate program of its kind, Aquinas' program-building effort for its signature Sustainable Business degree offers lessons and insights for those who might embark on a similar journey on the "sustainability frontier." Faculty creativity, administrative leadership, and external support all contribute to this innovative curriculum.