Yes. He had almost no influence at all. A copy of one of his Bible translations has been quoted in past Watchtowers. Over fifty years ago in 1955 the Watchtower printed this: "It comes as no surprise that one Johannes Greber, a former Catholic clergyman, has become a spiritualist and has published the book entitled “Communication with the Spirit World, Its laws and Its Purpose.” (1932, Macoy Publishing Company, New York) In its Foreword he makes the typical misstatement: “The most significant spiritualistic book is the Bible; for its principal contents hinge upon the messages of the beyond to those existing in the present.”" Watchtower 1955, 10/1 page 603. The Watchtower no longer references his works as support for their teachings. Edit: My apologies for not being more specific about when "no longer" began. I can only say, for the moment, as of 1983: Watchtower 1983 4/1 page 31: "Questions From Readers · Why, in recent years, has The Watchtower not made use of the translation by the former Catholic priest, Johannes Greber? This translation was used occasionally in support of renderings of Matthew 27:52, 53 and John 1:1, as given in the New World Translation and other authoritative Bible versions. But as indicated in a foreword to the 1980 edition of The New Testament by Johannes Greber, this translator relied on “God’s Spirit World” to clarify for him how he should translate difficult passages. It is stated: “His wife, a medium of God’s Spiritworld was often instrumental in conveying the correct answers from God’s Messengers to Pastor Greber.” The Watchtower has deemed it improper to make use of a translation that has such a close rapport with spiritism. (Deuteronomy 18:10-12) The scholarship that forms the basis for the rendering of the above-cited texts in the New World Translation is sound and for this reason does not depend at all on Greber’s translation for authority. Nothing is lost, therefore, by ceasing to use his New Testament." EDIT: Here is a brief list of several translations that indicate the Word is not God the creator (note that the NWT was nowhere near to being first): 1808: “and the word was a god.” The New Testament in an Improved Version, Upon the Basis of Archbishop Newcome’s New Translation: With a Corrected Text. 1864: “and a god was the word.” The Emphatic Diaglott, interlinear reading, by Benjamin Wilson. 1928: “and the Word was a divine being.” La Bible du Centenaire, L’Evangile selon Jean, by Maurice Goguel. 1935: “and the Word was divine.” The Bible—An American Translation, by J. M. P. Smith and E. J. Goodspeed. 1946: “and of a divine kind was the Word.” Das Neue Testament, by Ludwig Thimme. 1950: “and the Word was a god.” New World Translation of the Christian Greek Scriptures. 1958: “and the Word was a God.” The New Testament, by James L. Tomanek. 1975: “and a god (or, of a divine kind) was the Word.” Das Evangelium nach Johannes, by Siegfried Schulz. 1978: “and godlike kind was the Logos.” Das Evangelium nach Johannes, by Johannes Schneider.

which other translations use "the word was a god"?

Why wont people just quit bashing other religions, I'm not a Jehovah's Witness, but its still lame.

Father Johannes Greber was not ever a medium himself, but reported on messages we would refer to today in church as inspired of God. He reported honestly and only left the Catholic church because it did not support his asking God directly for answers, but desired that Father Greber first ask the Pope rather than God Himself. The Jehovah Witnesses only seem to have quoted his book for their own interpretations - but the JW's have nothing in common with the works of Father Greber. You might want to look at a site called JohannesGreber.com which has a copy of his book translated from the German, and a short essay on his godly Christian life. He seems to have been a pretty good fellow, if you just read through it. But he actually says in his book that he had never experienced a trance state (which is needed for mediums to communicate with spirits).