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Daniel Albion "Jumping Jack" Jones, Jr. played in the majors in 1883, splitting the season between the Detroit Wolverines and Philadelphia Athletics. With a strong showing in September 1883, he helped the Athletics win the American Association pennant by one game over the St. Louis Browns. Even before graduating from Yale, however, Jones began playing professional baseball. In early 1883 he played for the Toledo Blue Stockings in the Northwestern League. The Toledo baseball club was racially integrated that year, having Moses Fleetwood Walker as one of its catchers. It is not known whether Jones pitched to Walker during the season.

While playing major league baseball, Jones became known as "Jumping Jack" Jones, and was considered "the twirling marvel of his time." The nickname was based on his distinctive pitching delivery which involved "a leap skywards to give further impetus to the ball." While Jones's delivery drew ridicule, it also caused confusion on the part of batters. A newspaper account in September 1883 noted that his "habit of jumping high in the air" caused batters to become confused, noting that he generally delivered the balls other ways "until two strikes are called, when he jumps up in the air and pitches the ball in various and curious curves." Another account, published in 1892, observed: "Jumping Jack Jones was the marvel of the age when a pitcher was allowed to indulge in a few jig steps before he delivered the ball. While he was engaged in the delightful occupation of unjointing himself the frightened batsman was not sure whether the ball or an arm or a leg was coming over the plate."

Jones studied dentistry at his mother's successful practice for three years and then attended Harvard Dental School, receiving a D.D.S. degree in 1889. He also received an M.D. degree from Yale Medical School in 1890. Late in life, he retired from dentistry and took up "voice training." - Wikipedia

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