I have worked for over 30 years in competitive strategy. I teach it to future business and policy leaders, diplomats, global development leaders and social entrepreneurs. I have been a leader of the competitive strategy practices in two influential global consulting firms, where I advised CEOs, boards and policy heads. My academic training is as a game theorist, the science of figuring out your next move while anticipating the competitor’s moves to follow. Despite these credentials, I have never been invited to advise Donald Trump on competitive strategy.