Making problem solving a central part of teaching may be challenging to teachers who have limited experiences in learning and teaching mathematics in this way. Math Teachers' Circles were developed with the aim of establishing a "culture of problem solving" among middle school mathematics teachers. This culture could then be carried back into these teachers' classrooms. This article examines this culture of problem solving through the actions of one particular Math Teachers' Circle. Key features and their impact on particular teachers are also discussed. (Contains 2 figures, 2 tables and 9 online resources.)