In this acknowledgement, I would like to express my sincerest gratitude to all the people who have contributed in different ways to the success of this work. Thanks to the members of my committee, Dr. Wind, Dr. Scofield, and Dr. Han. I appreciate the thought-provoking impulses and the expertise. Special thanks to my supervisor Dr. Walker for his critical and helpful suggestions throughout the entire thesis process. I highly appreciate the freedom he gave me in choosing the subject and the path of my research. Prior to the degree, I had no experience in research; - he was very understanding and patient and guided me through the different steps of the project. I would also like to thank my family and friends as they always encouraged me and never made me doubt the overall project. To Jamie - thank you for your tremendous support not only throughout the whole project but especially in the beginning of the writing process. I am very grateful for your emotional support as well as your professional insight and experience that you offered with no hesitation. Finally, to my parents for showing their love and support, for always being there and offering me an open ear when needed, thank you! If I had to take one thing away from this – never doubt!