Sheppard announced more than 4,500 Yankees baseball games over a period of 56 years, including 22 pennant-winning seasons and 13 World Series championships; he called 121 consecutive postseason contests, 62 games in 22 World Series, and six no-hitters, including three perfect games. He was also the in-house voice for New York Giants football games for more than a half-century, encompassing nine conference championships, three NFL championships (1956, 1986, 1990), and the game often called "the greatest ever played", the classic 1958 championship loss to Baltimore.