Research for Action is one of the nicest companies I've had the joy of working for. The work culture is one about wanting to improve our schools, and this is very apparent with the people that work here.
The culture of this office is most apparent when there are many large projects happening simultaneously, and there is no sign of anyone having a bad time, even when the workload is heavy. This extends all the way through upper management, who are always looking to treat people fairly and understand what everyone in the office does.
This is one of the best companies to interact with.