Bill Fischer
"Mickey Mantles Longest HR 5/22/1963"

I sent a request to Bill Fischer who gave up Mickey Mantle's longest home run and this is what I got:

"11 inn. 2-2 count. Fastball. Yankee Std. Warm."
"Gave me my 1st lost [sic] of 1963."

For more information on Mickey Mantle's longest home run, click here.