Esther Derby is recognized as one of the leading experts on collaboration, teams, and retrospectives. She is co-author of Agile Retrospectives: Making Good Teams Great (Pragmatic Programmers, 2006) and Behind Closed Doors: Secrets of Great Management (Pragmatic Programmers, 2005). Esther is well known for her work in helping teams grow to new levels of productivity and coaching technical people who are making the transition to management. Esther's clients value her expertise, pragmatic approach, and her ability to reframe difficult interactions toward creative possibilities. She started her professional career as a programmer and now focuses on interpersonal communication, self-organizing teams, and group dynamics.