An adjustable vehicle seat suspension system comprising a support assembly, a regulating system, and a control system. In an exemplary embodiment, the control system, which can comprise a hardware control for setting-selection by a human operator, directs the regulating system to adjust the support assembly as needed. Based on the human operator's chosen settings, the regulating system, in conjunction with the support assembly, can emulate a passive, semi-active, or active suspension. Preferably, the regulating system comprises a rotary motor, which drives the support assembly.