He has invented 21 products for treating heart disease. He led the growth of two multi-million dollar health companies, which eventually sold to Medtronic for over $4 billion in the late '90s. He has even run for governor of California. Now serial entrepreneur Howard Leonhardt wants another notch on his belt: To help create 23 million American jobs. He plans to do it by starting the California Stock Exchange—think NASDAQ for start-ups and small businesses....Read more A Start-up to Create 23 Million Jobs in America?