Joel Klette is a well-known copywriter and entrepreneur. He currently runs two businesses. He's also a prolific writer and educator. I don't know anyone who has shared as much knowledge on copywriting as Joel.
Check out Joel's businesses, Business Casual Copywriting and Case Study Buddy, as well as his fantastic Twitter account. This is a preview of Superpath Pro. If you want a whole lot more of this, check it out here.