This study examined the mediating role of task complexity in the relationship between core self-evaluations (CSE) and satisfaction. In Study 1, eighty three undergraduate business students worked on a strategic decision-making simulation. The simulated environment enabled us to verify the temporal sequence of variables, use an objective measure of task complexity, and control confounding factors. In Study 2, we surveyed 108 full-time employees. In addition to verifying the temporal sequencing of variables in Study 1, both studies demonstrate that people with higher CSE actually choose/seek higher levels of complexity on their tasks, which directly or indirectly increases their task/work satisfaction. (Contains 3 tables and 3 figures.)