Pat is the founding principal of Stat-Ease, Inc and now works as a Statistical Consultant. Before starting his own business, he worked as a chemical engineer, quality assurance manager, and plant manager. Pat co-authored Design-Ease® software, an easy-to-use program for design of two-level and general factorial experiments and Design-Expert® software, an advanced user's program for response surface, mixture, and combined designs. He's provided consulting on the application of design of experiments (DOE) and other statistical methods for several decades. In addition, Pat is co-author of the books, DOE Simplified: Practical Tools for Effective Experimentation, 3rd Edition, RSM Simplified: Optimizing Processes Using Response Surface Methods for Design of Experiments, 2nd Edition, and Formulation Simplified: Finding the Sweet Spot through Design and Analysis of Experiments with Mixtures and has published many articles on design of experiments (DOE).