peter drucker, whose clear thinking and engaging analysis made him the epitome of the management guru, has died at the age of 95. never an economist, nor even a businessman, drucker was a journalist. he just knew the right questions to ask. his questions made us better people, as well as more effective mangers. his creed of value and service first, profits later, gives business a human purpose like few others. and his questions should be asked every day by us all: what is our business? who is the customer? what does the customer value? bruce marcus puts drucker into context for professional services firms in “the death of a giant.”