An articulating support arm includes a base, at least first and second links, a control head and a platform. The base, first and second links and control head are pivotally connected in a four bar linkage configuration. The control head has a forward end pivotally connected to the platform and the platform is movable from a forward fully extended position wherein the control head is forward of the base to a rearward fully retracted position wherein the control head passes below and to a position rearward of the base.