I hope that Ms. Barahona received an email that I sent to her in response to her direct query to me. My reply might be of interest to other O'Hara fans on your list.
Requests for permissions should be directed to the Wylie Agency, who represent John O'Hara's Estate attorneys. Here is their contact information:
250 West 57th Street
New York, NY 10107
Phone 1 212 246 0069
Fax 1 212 586 8953
This information can be found in the finding aid for our O'Hara Papers (http://www.libraries.psu.edu/dam/psul/up/digital/findingaids/2409.htm).
Your readers might also like to know about a useful database called WATCH (Writers, Artists, and Their Copyright Holders), which is run by the Harry Ransom Center at the University of Texas at Austin. They provide contact information for prominent creative figures. Here is their site:
Curator of Rare Books and Manuscripts
Penn State Libraries