First and foremost, I would like to thank my savior and lord, Jesus Christ, for giving me strength and courage to pursue this project.

I would like to dedicate this book to my father (Appachan), the late C.O. John, and my dearest mom (Ammachi), Leela John, for helping me reach where I am today. A special thanks to my dearest wife, Serene, and our three lovely children, Neil (son), Anaya (daughter) and Hazel (our newborn sweet baby girl - DOB 18.07.18), for all their support throughout this project and also for tolerating not being with them after my busy day job. Last but not the least, I would like to thank my uncle (Appappan), Thomaskutty C.O, who took the initiative to introduce me to a variety of books during my studies.