Mack has fair skin and amber hair which is tied in a ponytail. He wears black aviator sunglasses and he wears a red bandanna around his head. He is shirtless but wears a black jacket, coupled with dark blue jeans. He wears fingerless gloves and brown cowboy boots.
He is a very caring person, as seen in episode 99, where he took Ichinose Kazuya off the field because he knew about his condition.
He first appeared in episode 98, watching his team play against Inazuma Japan. In the next episode, it was shown that he knew about Ichinose's condition and took him off the field in the second half of the match.
Inazuma Eleven Orion no Kokuin
Mack made his first appearance in episode 28 when American team Star Unicorn came back from match with Russia. While he was talking with Ichinose Kazuya and Domon Asuka, some members of Inazuma Japan appeared and proposed later a small game for fun. As it turned out finally Endou Mamoru scored a goal for Japan and while they were celebrating their reunion, some helicopters flew. To their much surprise a group of people dressed in military uniforms came down and they lined up in two rows. Their commander Bahat Descom silently made several gestures, indicating to his subordinates what to do. In the blink of an eye they approached Mack and caught him. The commander stated that Mack was being arrested on suspicion of illegal use of his team's budget and violation of their trust. When Mack denied the accusations, Bahat admitted that if he was innocent he would be cleared of charges but it would certainly last up to several months. Once again he made a few gestures and Mack was taken, with opposition to members of his team. Bahat declared that now he was taking over the role of the America's coach and it was a decision consulted by the staff of the American football. What's more, the Star Unicorn in order to maintain its place in the national team must take part in the match against the Navy Invader. If they won, nothing would change but if they lost they would have to leave. Finally they lost and the Navy Invader took their place in the national team.