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In this paper, a two-degree-of-freedom (DOF) dynamic model of an on-highway truck seat is created using the Simulink simulation program from MATLAB. Engineering properties of the seat used in the model are measured in the laboratory, obtained from seat component manufacturers, or estimated using engineering judgment. Modeled parameters include: air spring force, damper force, end-stop force, cushion force, seat belt force, driver mass, and cab vertical oscillations due to road disturbances. The model is developed to facilitate seat design as a means of increasing the comfort level that on-highway truck drivers face while carrying out their everyday tasks. Field testing of the seat is performed in order to validate the model. National Instruments hardware and Labview software are used for the data acquisition.