This book is based on knowledge acquired during my work as a trader at Barclays Capital. Therefore, I would like to thank my colleagues at Barclays Capital who have been very helpful in teaching me the theory and practice of options. At Barclays Capital I would especially like to thank Faisal Khan and Thierry Lucas for giving me all the opportunities to succeed in mastering and practising option trading. I would also like to thank Thierry Lucas for his many suggestions and corrections when reviewing my work and Alex Boer for his mathematical insights. I would especially like to thank Karma Dajani for first giving me a great foundation in probability theory, then supervising my graduate dissertation in mathematics and, lastly, reviewing this book. Special thanks goes out to my father, Jan de Weert, for having been a motivating and helpful force in mastering mathematics throughout my life, and for checking the book very thoroughly and giving me many suggestions in rephrasing sentences and formulae more clearly.