Carl Icahn is extremely successful as an investor and businessman. He's known for his savvy in turning around struggling companies and has amassed a fortune estimated in the billions. In Forbes' list of highest-earning hedge fund managers, he's often featured. Icahn has influential stakes in major companies and has been a key player in various high-profile business deals. His impact on Wall Street is significant, cementing his legacy as one of the most successful investors of his time.