Due to simulation glitch MOSFETs width must be manually turned up to 60um after starting the simulation.
Once MOSFET width is changed to proper value after starting simulation you can see that by altering the value of the zener diode one can change the voltage seen across the load. This set up can also be used as a constant current device when a known resistor is placed between the source and ground (commonly 1ohm or less) resulting in a voltage scale relating to current. The zener diode network may be replaced with a potentiometer with a small capacitor on it for noise stability.
