Abstract: A vertically adjustable work station including a first pair of vertically oriented, spaced rails (5) to be stationarily mounted on an existing wall panel (1) of a conventional work station, a second pair of vertically oriented rails (6) individually, slidably, interlockingly disposed in the first pair of rails (5), a pair of support brackets (3) having engaging teeth (17) protruding therefrom so as to be individually mounted on the second pair of rails (6), a work surface (4) supported by the support brackets (3), a pair of interconnecting channels (7, 8) for respectively interconnecting the first and second pairs of rails (5, 6) and a drive mechanism coupled between the interconnecting channels to move the channels toward or away from each other so as to attendantly displace the work surface (4).