I am now retired.
As most of you know, I have written the book: Control Systems Engineering Exam Reference Manual - A Practical Study Guide for 14 years now. It is for the NCEES PE/CSE (Professional Engineer – Control Systems Engineering)examination.
It is now in the fourth edition and is recommended material by ISA (international Society of Automation) and is referenced by the NCEES web site, under the PE - Control Systems Exam section.
Please see my new site Learn Control Systems for online training in control systems and industrial networking design.