Here’s what I have been able to glean about
CHARLES M. QUINLAN SR.Charles Quinlan in the 1940 Census. First Name: Charles. Last Name: Quinlan. Age at Time of Census: 59. Gender: Male. Race: White. Ethnicity: American. Est. Birth Year: 1881. Birth Location: New York. Enumeration District: 36-30. Residence: Highlands Town, Orange, NY. Relationship to Head of Household: Head. Other People in Household: Marion Quinlan, 34 yrs, Female; Charles Quinlan, 11 yrs, Male; Diana Quinlan, 1 yrs, Female. Marital Status: Married. Language: English. Genealogical Society Number: 005458680. NARA Publication Number: T627. NARA Microfilm Roll Number: 2708. Line Number: 23. Sheet: A. Sheet Number: 9. Collection: 1940 U.S. Federal Population Census. –Ancestry.com, Aug 01, 2015
Charles Quinlan was Worth Carnahan's business partner in Bilbara, Worth and Hit Publishing (there's an interview with Carnahan's daughter [Cynthia Woody] in an issue of Comic Book Marketplace [#71, Sep 1999] somewhere that covers this). After the titles published by those three companies ended, Quinlan moved over to Helnit, and eventually took over as art director there. –fox_centaur, Apr 07, 2010 @ 12:47:45 PM, The Digital Comic Museum Forum
Charles M. Quinlan was active in the comics field during the 1940s and 1950s. He drew “Cat-Man and Kitten” for Helnit Publishing Company (1941-1944). He also drew Lone Eagle for Better Publications (1944-1947), Hopalong Cassidy for Fawcett (1948-1949), Two-Gun Lil and romance stories for Quality (1950-1951).
Charles M. Quinlan’s art is pretty good and he even puts himself in one of the stories (Cat-Man #15, Page 3, Panel 4). Super-heroes don’t always need to be deadly serious to entertain. –Crimson-Blu-Green, Jul 22, 2016 @ 09:26:00 PM, Digital Comic Museum Forum
QUINLAN, CHARLES was born 01 November 1880, received Social Security number XX-XX-XXXX (indicating Railroad Board) and, Death Master File says, died January 1966 (age 85). –SortedByName.com, 01 Mar 2014
Note: SSNs between 700-##-#### and 728-##-#### were issued to a railroad worker (no longer issued). Within the 700-01-xxxx to 728-26-xxxx range, the 4th and 5th digits indicate when a number was issued (700-09-#### issued between 1936 and 1950). –Railroad Board SSNs issued in 1936,
https://www.ssn-verify.com/lookup/railroad-board, Dec 07, 2021