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It has been a great pleasure to work with all the guys and girls in the group because of the ambience that exists in the group, allowing us to enjoy the student-life we love to live. Salutations to James and Miles, who were always willing to share their wisdom and experience, either academically or socially. Thanks to Klaus, for his invaluable suggestions when all else failed. Thanks to Connie, Leslie and Pam, without whom all the things we take for granted would never get done. Without the technical support of Tony Barker, Rob Senekal and Charlie Ledger, I would not have had the equipment which by now has become one of my closest friends and greatest enemies. A special thanks to my parents, Ton and Ank, for their unassuming belief in me, and to Marc and Marjolijn, who've had to put up with me for over two decades.