Anonymous 'Mr. ' and 'Mr. '.
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Anonymous 'Mr. Jones, a Hypnotist and an Author...' and 'Mr. Jones, a Hypnotist and Author...'.They are both acceptable. The first suggests to me that Jones writes about other things than hypnotism (though he may also write about hypnotism) , the second that he writes (mainly) about hypnotism. That is only a personal opinion.