# Nat Knight

## Contribution from Nat Knight, former regional director, Americas, Risk Waters

I was lucky. Usually, I would have gone to any conference and been there early to mingle with our customers before the event started. But for some reason, I had gone to Chicago the day before. I remember waiting for my first meeting and seeing on a small TV the first plane crash into the Towers, and failing to understand the effect this would have. My meeting was cancelled and I went back to the hotel. I tried calling several of my colleagues who were supposed to be at the event, but everyone’s cell went straight to voicemail. As the day unfolded, I finally managed to contact the New York office (who were relieved to hear I wasn’t there) and the truth slowly dawned – whilst I hoped they had got out, it was fairly clear that they hadn’t. I still feel sad that their lives were taken away from them, and often think ‘What if we had held the event on another day…..’.

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#### Derivatives

###### Axes that matter: PCA with a difference

Differential PCA is introduced to reduce the dimension in derivative pricing problems