If leadership were a stool, here are the four legs Huntsman Chemical Co. Founder Jon Huntsman says would support it:Family comes first. Parenthood and familial relationships are essential leadership building blocks.Vigorous pursuit of work. Compete against yourself and create value.Public service. Huntsman’s service ranged from gunnery officer in the Navy to assistant to U.S. presidents.Service to faith. No matter what your spiritual bent, you should spend time enacting your beliefs.— Adapted from “Huntsman: The last great American industrialist,” Jake Miller, Tom Champion, Gautam Mishra, Wharton Journal.