As Wikipedia and at least one answer on this site suggest, the name stylometry encompasses certain techniques to determine authorship of text. Although stylometry itself appears to require a certain amount of expertise, I conjecture that an average reader of a piece of text could make an unscientific guess as to the text's author if the reader were familiar with other texts known to have the same author. I refer here not only to "famous" texts ("that sounds like Shakespeare") but also to much more mundane texts such as e-mail correspondence.
Are there techniques known to enable an author to incorporate ideas of his or her choice in an English-language text while disguising the authorship of the text? If so, what techniques exist? Do these techniques work with the casual reader, the more technical processes of stylometry, or both?
After posting this question, I found an interesting academic paper on this exact subject. The paper does not indicate that any particular method of attack was used, as the participants in the study were not linguists. I am more interested in what the authors call obfuscation attacks than imitation attacks, but answers pertaining to either are fine.