The man in the picture is Harrison Ford. He is an actor who works in Hollywood. In this photo he is in his forties, but now he is seventy three years old.
He is wearing a white t-shirt, a war jacket, black-brown trousers, a war belt and a pistol . He is dressed like this because he was acting in the film Star Wars. He is a very tall and very funny actor, as you can see from the pose he is making here.