During
World War II, Wallop worked for
United Press in Washington, D.C. He was skilled in stenography and shorthand. In 1948, he worked as a secretary for
Dwight D. Eisenhower while Eisenhower wrote
Crusade in Europe. He moved to
New York City and worked for the
Associated Press. His first novel, 1953's
Night Light, concerns a father's search into the background of his child's murderer. Anne Brooks of the
New York Herald Tribune Book Review said he "created characters who are both real and colorful, and he has delved into a maniac's mind with considerable understanding." R.G. Peck wrote an article for the
Chicago Sunday Tribune and said it was the "first novel that's well constructed, carefully written, and free of painful mannerisms." Al Hine of the
Saturday Review said it's a "novel that is moving and tautly interesting from the first page to last. Mr. Wallop writes fluently and without affectation, even when he is exploring the subcellars of bop." He authored 14 works, including
The Year the Yankees Lost the Pennant (1954), which was adapted by Wallop and
George Abbott into the
Tony Award-winning musical
Damn Yankees. == Awards ==