“Drucker “understood that his job wasn’t to serve up answers,” according to Wartzman. Drucker once remarked that his greatest strength was “to be ignorant and ask a few questions.” Often those questions were deceptively simple, as in Who is your customer? What business are you in? The clients who hired Drucker may have started out expecting the great consultant to offer brilliant solutions to all their problems. But as he told one client, “The answers have to be yours.”