Mark is 53 years old, owns his own plumbing business and flips the occasional trailer/mobile park home. He never went to college and has never made over 40K annually; at one point he had 50K in credit card debt. His net worth is primarily held in mobile homes which he fixes up, then flips and finances to the next buyer. Mark shares his thoughts on taking career chances, starting early, and the risk/reward of small business.