Whose brisk and business like in the notorious jumping frog of calaveras county?

In Mark Twain's "The Celebrated Jumping Frog of Calaveras County," the character who is described as brisk and businesslike is Simon Wheeler. He is a talkative and somewhat jovial man who recounts the story of Jim Smiley and his betting habits with great enthusiasm and detail. Wheeler's straightforward manner and engaging storytelling style embody the spirit of the tale, highlighting the themes of humor and deception.