I saw this on Facebook and also one posted on Trackforum:

"Hi all, 3 Time AMA Champ & 2 Time USAC Champ Joe Leonard. Hero from the
golden age of Indy ...Almost won in a Turbine !!

He had a stroke last year, and in a home . He need's some cheering up...
Send a Christmas card to.....

Mr. Joe Leonard
c/o Belmont Village of Sunnyvale
1039 E. El Camino Real
Sunnyvale, Ca. 94087"

I might also add he was a very solid wheelman in a sprint car too.