Full disclosure, I am the Editor of this book. In 1977 I started to work full time on fiber optic sensors at McDonnell Douglas Astronautics Company (MDAC) in Huntington Beach, California. Because of strong interest in my work on fiber gyros and acoustic sensors I received internal and government funding allowing the addition of people. Since the field was new, I started teaching a course in 1978 to train people working with me. A textbook did not exist, and I started to work on one in 1981. This resulted in the book Fiber Optic Sensors: An Introduction for Engineers and Scientists that first appeared in 1991 and is now in its 3rd (2024) Edition. One of the spin offs of my fiber gyro work involved a strain sensor based on the Sagnac interferometer and I soon had strong interest from Douglas Aircraft for transport aircraft and McDonnell Aircraft (MCAIR) for fighter aircraft as well as MDAC for rockets and the space station. While I included a chapter in the 1991 book on fiber optic smart structures and I organized the early conferences on the topic for SPIE, these did not capture the breath and scope of the efforts at McDonnell Douglas involving about 200 people in a Working Group I organized and our collaborating organizations. To correct this, I started to organize this book in about 1992 and with the help of many leaders in the field managed to complete it during my first two years at Blue Road Research, a company I founded in 1993 to allow my family to relocate to the Pacific Northwest. Although this book is now 30 years old, I think it is interesting to look back at the basis of what is now the widely used field of fiber optic smart structures that is utilized in aerospace, defense, oil and gas, medical, electric power and environmental applications.