The first 16 years of Dr. Semyon Rabinovich’s career were spent in industry, where he created a number of electrical measuring instruments, including those that were mass-produced, as well as unique direct-voltage measuring instruments reaching the theoretical sensitivity limits. Following this, Dr. Rabinovich organized the Laboratory of Theoretical Metrology at the All-Union State Research Institute of Metrology (VNIIM) in the former USSR and was the head of this lab for the next 16 years. After a period in the aftermath of his decision to emigrate from the USSR when any reference to his name was a taboo, VNIIM now lists Dr. Rabinovich among their “renown scientists” in the theoretical metrology area. After moving to the USA, he took part in the work of two ISA Subcommittees in preparing ISA-RP67.04 “Setpoints for Nuclear Safety-Related Instrumentation” and “Methodologies for the Determination of Setpoints in Nuclear Safety-Related Instrumentation.” He has published six books and more than 100 other publications including 21 patents. Previously this book was published by American Institute of Physics.