George S. Kaufman? Scott Meredith? Apocryphal?

Question for Quote Investigator: Bright remarks are often misattributed to famously witty individuals such as Dorothy Parker. An exasperated fellow humorist once said:
Everything I’ve ever said will be credited to Dorothy Parker.
Would you please help me to locate a citation and tell me who said this?
Reply from Quote Investigator: The earliest close match known to QI occurred in a 1974 biography titled “George S. Kaufman and His Friends” by Scott Meredith. The author stated that Kaufman and Dorothy Parker moved in the same social circles, and they wrote a screenplay together for a short film called “Business Is Business”. Yet, they were not really good friends. Boldface added to excerpts by QI:1
There was a certain amount of rivalry between them: Kaufman once said gloomily, “Everything I’ve ever said will be credited to Dorothy Parker.”
The above citation appeared more than a decade after Kaufman’s death in 1961. So the evidence it provides is not strong.
Here are additional selected citations in chronological order.
Continue reading “Quote Origin: Everything I’ve Ever Said Will Be Credited To Dorothy Parker”