An arm assembly for a chair having a post, a first member, and an armrest. The first member is angularly adjustable relative to the post about a first axis between first angular movement limits, with a non-finite number of angular adjustment positions of the first member relative to the post. The armrest is operatively connected to the first member to translationally slide generally forward and rearward relative to the first member between first translational movement limits, with a non-finite number of translational adjustment positions of the armrest relative to the first member. The armrest is angularly adjustable relative to the first member about a second substantially upright axis between second angular movement limits, with a non-finite number of angular adjustment positions of the armrest relative to the first member.