This document summarizes a case study on volunteer motivation and satisfaction at the 2004 Twin Cities Marathon. It begins with an introduction on motivation theory and literature reviewing theories of altruism and mixed motives. It then describes the study methodology of surveying 254 marathon volunteers. Results found most volunteers were female, average age 39, and well-educated. Analysis of survey data on motivations and satisfaction is also discussed. The conclusion emphasizes the importance of leaders understanding different motivations and tapping into them to effectively motivate diverse groups.