A decent domestic player indeed. When the first USCF rating list was published in 1950 he was 6th.
Reuben Fine 2817
Samuel Reshevsky 2770
Alexander Kevitz 2610
Arthur W. Dake 2598
A. C. Simonson 2596
Fred Reinfeld 2593
Arnold S. Denker 2575
Isaac Kashdan 2574
I. A. Horowitz 2558
Abraham Kupchik 2538
The list was based on lots of old tournaments. Well before 1950 Reinfeld was done playing competitively.
His early books are considered worthy but later ones often are uninspired rehashes of earlier work. He had diverse interests and wrote books on mineralogy and coin collecting.
What was Fred Reinfeld like as a player and as a author ?