John P. D'Agostino Sr., generally credited as Jon D'Agostino (June 13, 1929 – November 28, 2010) was an Italian-American comic-book artist best known for his Archie Comics work. As well, under the pseudonym Johnny Dee, he was the letterer for the lead story in the Marvel Comics landmark The Amazing Spider-Man #1 (March 1963), as well as other seminal Marvel comics.
D'Agostino is not the French comics artist Tony D'Agostino, a.k.a. Tony Dagos, whose early work was signed "D'Agostino". He is also not the concurrent early-Marvel letter John Duffy a.k.a. John Duffi.
Source: Wikipedia, "Jon D'Agostino", available under the CC-BY-SA License.