Paul Gruhn is the Training Manger at ICS Triplex | Rockwell Automation in Houston, Texas. Gruhn is an ISA Fellow, a member of the ISA 84 and 101 committees, co-author of the ISA textbook "Safety Instrumented Systems: Design, Analysis and Justification", and an author of many articles. He is the developer of the first control and safety system modeling software program. Gruhn has a B.S. degree in Mechanical Engineering from Illinois Institute of Technology, is a registered Professional Engineer in Texas, and an ISA 84 Expert. He is the developer and instructor for ISA courses on safety instrumented systems and started teaching for ISA in 1996.