Abstract: An ergonomic support device having a platform supported by a telescoping support arm which is in turn adjustably supported on a vertical post. The vertical post may be clamped to a desk, table, or the like so that the platform is elevated relative to a desk top, for example. The connection of the platform to the support arm provides for a wide range of adjustment of the platform, including tilting, pivoting, and back and forth translation. The device also provides for vertical and pivotal adjustment of the support arm relative to the vertical post, which further increases the range of adjustability of the platform. The adjustable platform supports reading materials and the like so that a user can stand while reading, writing, or performing other routine desk work, thus enhancing dynamic movement of a user who would otherwise be sitting in a sedentary position for lengthy periods.