When asked to write a speech I always feel privileged that I've been given the opportunity to create something that is intensely personal but, at the same time, will be heard by a large and potentially influential audience.
Over the years I've written a number of speeches for CEOs and senior marketing managers at one of the world's largest multinationals. Normally they don't want the world to know that someone else is (partly) responsible for what they say in public, so I can't really be any more specific about who I work for!
But to give you some idea of my role, I recently wrote three separate speeches for one of the most respected figures in the international design world. Each time the basis was an interview in which he outlined the topics he wanted to address, and after that I basically went away and came up with the structure and content myself. And he loved it.