Abstract: A chair comprising a seat assembly and a support assembly is disclosed. The seat assembly has a deflectable body disposed about an axis that provides resilient convex seating surface. The support assembly retains the seat assembly and allows the seat assembly to rotate about its axis and additionally allows the seat assembly to rotate to cause limited tilt displacement of the axis from a neutral alignment. The support assembly includes biasing means that serve to urge the seat assembly towards the neutral alignment when the seat assembly is displaced from the neutral alignment.