A cordless, power-adjustable office or task chair comprising: a seat height adjustment mechanism, including an electric motor, the upper and lower members of the adjustable column relative to each other to raise and lower the height of the seat. A seat tilt adjustment mechanism, including an electric motor, moves the top plate relative to the bottom plate to adjust the angle of tilt of the seat. A seat position adjustment mechanism, including an electric motor, moves the seat relative to the top plate. A back tilt adjustment mechanism, including an electric motor, moves the back support strap to tilt the chair back forwardly and rearwardly. A back height adjustment mechanism, including an electric motor, moves the back axially with respect to the back support strap. A seat height switch controls the seat height adjustment mechanism. A seat tilt switch controls the seat tilt adjustment mechanism. A seat position switch controls the seat position adjustment mechanism. A back tilt switch controls the back tilt adjustment mechanism. A back height switch controls the back height adjustment mechanism. Each of the switches is positioned so as to be operable by a user seated on the chair.