Sir Ronald Cohen is one of the founders of impact investment, a preeminent international philanthropist, venture capitalist, private equity investor, and social innovator, who is driving forward the global Impact Revolution. I have the pleasure to work alongside Sir Ronald on designing his personal website as well as being a part of the On Impact team. On Impact is a guide that expresses why now is the time for placing impact at the centre of our consciousnesses, and compels readers to become part of the #ImpactRevolution.