The way you communicate the personas and present your deliverables is key to ensuring consistency of vision. Without that consistency, you’ll spend far too much time arguing with your colleagues about who your users are rather than how to meet their needs.
made his greatest leaps in practicing the craft of interaction design when he used to work for Cooper Interaction Design. These days he consults independently (though with other former Cooperistas) for companies that don't have the liberty to screw up their products. When he's not designing, he can be found playing volleyball, improvising or improvising as a volleyball (you try that sometime.