Rob says it is Papa Bear George Halas coach of the Chicago Bears. But I am guessing it is Ernest Hemingway. Unless you give more hints, this is too broad an area because Papa Bear reference can be to many venues, including music (Aaron Glass), writers, (Hemingway!), characters in books and on TV programs (Hogan's Heroes). Internet is iffy today, will check in later. But I'm thinking Papa is Hemingway and Papa Bear is one of the affectionate terms he was given by young paramours.