The lower middle class is the second most populous according to both Gilbert's as well as Thompson & Hickey's models, constituting roughly one third of the population, the same percentage as the working class. However, according to Henslin, who also divides the middle class into two sub-groups, the lower middle class is the most populous, constituting 34% of the population. In all three class models the lower middle class is said to consist of "semi-professionals" and lower level white collar employees. An adaptation by sociologists Brian K. William, Stacy C. Sawyer, and Carl M. Wahlstrom of Dennis Gilbert's class model gave the following description of the lower middle class: