John R. (Ray) Sinnock
(1888 - 1947) was the eighth Chief Engraver
of the United States Mint
and designer of the Roosevelt dime
and Franklin half dollar
, among other U.S. coins. His initials "JS" on the dime can be found at the base of the Roosevelt bust. He also sculpted, although did not design, the Purple Heart
medal, and various other medals and commemorative coins.
Sinnock was born July 8, 1888 in Raton, New Mexico and was educated at the Philadelphia Museum School of Industrial Art. He won the A.W. Mifflin Award for study abroad.
For ten years Sinnock was an art instructor at both his alma mater and at Western Reserve University. He was appointed Assistant Chief Engraver in 1923.