My interest in and understanding of quantitative finance has been shaped over the years by brilliant colleagues and mentors: Antoine Savine, Hamza Hoummady, Anas Benabid, Valeri Rousskikh, Jérôme Lebuchoux, Arvind Giridhar, Dunstan Marris, Elie Franko, Tingfai Ng, Jiri Hoogland, George Lowther, and many more.