If you fold at the first un-returned email what hope do you have as an entrepreneur? As an entrepreneur, people aren’t going to respond to you and it’s your responsibility to politely and assertively stay on people’s radar screen. You no longer work for Google, Oracle, Salesforce.com or McKinsey where everybody calls you back. You had no idea how important that brand name was until you left it behind. Your customers don’t care that you went to Standford, Harvard or MIT. It’s just you now. And frankly if you went to a state college in Florida you’re at no disadvantage in the tenacity column. Persistence will pay off.