An outfielder, Lennon was born in Brooklyn, New York; he threw and batted left-handed and was listed as 6 feet (1.8 m) tall and 200 pounds (91 kg).

After three seasons in the low minors, he was acquired by the Dodgers' bitter rivals, the New York Giants, who became the parent club of the Vols in 1952.

The following season, he had his longest Major League stint with the 1956 Giants, appearing in 26 games, including 21 in the outfield, but he batted only .182 with one extra base hit, a double.

As a Cub, he hit his only Major League home run, in Brooklyn's Ebbets Field on April 30, 1957,[3] a three-run shot off former Giant teammate Sal Maglie.

[2] In between, Lennon played winter with the Navegantes del Magallanes in Venezuela add the Cangrejeros de Santurce in Puerto Rico, appearing for them in the Caribbean Series in the 1955 and 1959 editions, respectively.