Well, that depends very much which Chris Powell you'd like to write to. Below are some Chris Powells and a bit of information about each one.
Chris Powell, International Organ and Keyboard Virtuoso
Chris is one of the UK's most busy entertainers. As well as wowing audiences at home, Chris has conquered the Australasia market. Details of the festivals and gigs he is playing and contact details for anyone who'd like to write to Chris are available here.
Chris Powell, Personal Trainer and Transformation Specialist
This Chris Powell helps fat people to get thin. He's so good at it that he's on the TV. He also writes books to spread his healthy-eating, super fit message. His website has a contacts page.
Chris Powell, Photographer
Is this the Chris Powell you"re looking for? He takes photographs. They"re really nice. Have a look.