Measure career success, total up your relationships — not your pay checks.

Harvard Business School professor Clayton Christensen is arguably one of the most influential thinkers in management today. He’s most famous for developing the concept of “disruptive innovation” — the idea that established industries are vulnerable to being upended by fresh competitors with low-priced, apparently inferior products. Articulated in his landmark 1997 book, “The Innovator’s Dilemma,”…