Everybody has to start somewhere. Whether it's working as a babysitter or selling shoes at the local mall, your first job is momentous. It teaches you valuable lessons about life, hard work, and who you want to become. A-listers and leaders Rachel Zoe, Oprah Winfrey, Katie Couric, and President Barack Obama shared the nostalgic story behind their first job in a series for LinkedIn. Scroll down to find out how some of America's most successful people launched their career.