San Francisco investment boutique Thomas Weisel Partners just offloaded another 100 employees (spurring more rumors the firm will be sold), but its 62-year-old founder is busy charging up other hills. Weisel, a renowned cyclist, has been promoting his new autobiography, Capital Instincts: Life as an Entrepreneur, Financier, and Athlete, and doling out the tome to clients. The book isn't exactly flying off the shelves (Amazon rank: 9,136), but it's packed with testosterone-charged tales of Weisel's athletic, business, and art-collecting exploits--including his recent $40 million sale of abstract impressionist art. Chapter 1: "Never Underestimate Thom Weisel." (Fortune Magazine, March 31,2003)