Mark Hurd is a very important person, as he is the current co-SEO of Oracle Corporation, the second largest software distributing company after Microsoft. A person who is in such an important position needs to be determined and needs to work harder than anybody in that particular company. He also needs to know how to make changes which will help the company get further and more successful.
Mark Hurd has done some hard decisions, but ultimately the company that he was working for benefited from his actions. This is the main reason why he was able to secure his role as a leader in three very successful companies.
Of course, as he is just a person, he did have different ideas when he was younger. He wanted to become a professional tennis player, but after he realized that he is not good enough to be one of the best, he decided to work in business and sales instead, which made him the powerful and influential person he is today. The businesses that he worked for would not be as successful and well-known if he was not a part of them. His determination as well as skills ensures that these companies are going to be around for a long time.