A portable electric height adjustable platform assembly, and method of use, the assembly residing on a fixed height desktop to move a computer monitor, keyboard, and mouse between a user's sitting and standing position. The platform assembly comprises: a horizontally positioned platform unit configured for supporting a computer keyboard and mouse; a height adjustable lifting column unit comprising three telescopic sections, affixed vertically to the platform, with the outer section positioned above the platform unit to affix the monitor to, and the middle and inner section extensible below the platform to raise-lower the assembly; a base unit affixed to the bottom end of the lifting column unit, and configured to stabilize the assembly in a vertical position; an electric actuator housed within and able to activate the lifting column unit to vertically extend and collapse the telescopic sections, thus simultaneously raising and lowering the computer monitor, keyboard, and mouse.