Conversation so far:
What sort of controversy did Eileen J. Garrett have?
On 7 October 1930 it was claimed by spiritualists that Eileen J. Garrett made contact with the spirit of Herbert Carmichael Irwin two days after the R101 airship disaster.
Who wrote that the spirit of Herbert Carmichael Irwin spoke with Eileen J. Garrett?
In 1978, paranormal writer John G. Fuller wrote a book claiming that Irwin had spoken through Eileen J. Garrett.
What other controversies did Eileen J. Garrett have?

Question: Who questioned the claim?
Self-contained rewrite: Who questioned Eileen J. Garrett's claim of contacting deceased Herbert Carmichael Irwin?