Steve Mustard took his 30 years of experience and wrote Industrial Cybersecurity: Case Studies and Best Practices, published by ISA. After talking about who the book is for and the writing process, Dale and Steve dig into the details. 

Given Steve's longtime involvement and leadership with ISA, it's not surprising the book leans heavily on ISA/IEC 62443. They talk chapters on architecture, certification, optimism / pessimism, risk management and a fundamental misunderstanding of IT by OT. Some agreement, some disagreement, and always a civil discourse.