Bobby Shantz. I knew the answer as soon as read "Philadelphia A's" and that he was 5'6".

In 1952, his MVP year, he went 24-7 with an ERA of 2.48. That was 30% of the A's 79 wins. He was really the only reason the A's had a rare winning record that year. The first third of his career he was a starter, the last two thirds a reliever, after a number of injuries. The A's traded him to the Yankees where he was on 4 consecutive pennant winners, including a world championship in 1958.

One other thing you didn't mention - he won the first AL Gold Glove for a pitcher, his first of 8.

He was also involved in the (in)famous Lou Brock trade.

was offset by the infamous (for the Phillies) Fergie Jenkins trade 2 years later by the same GM.

Saw him pitch vs St. Louis Browns at Shibe Park.

I had heard of him before. Didn’t know any of those facts about him, especially that he’s still alive.