Going clockwise around the table:

Audrey, biography; Pete, graphic novel; Janet, screenplay; Victor, poetry; Horatio, self-help; Sarah, cookbook

Note: Because everyone sits at a round table, the diagrams below could be rotated and still provide a correct solution. The positions of the people at the table are arbitrary, while the positions of the people relative to each other are not.

The clues by Horatio and Janet both refer to the poet. Similarly, the clues by Sarah and Pete both refer to the screenplay writer. This will help us connect the clues together.

Horatio: "I really haven't been able to offer any advice to the poet on my right, so instead I've been suggesting some visual imagery for the graphic novelist across from me."

Janet: "The poet on my left writes such lyrical phrases, it is sometimes difficult to give him any advice. However, I have been taking home a few of the recipes from the cookbook author, seated across from me. My husband is a chef, so we're helping test them out."

Combining Horatio's and Janet's clues yields this arrangement:

Sarah: "The screenplay writer sitting across from me is working on a project that sounds fascinating. I can't wait for it to be finished."

Pete: "I'm trying to help the screenplay writer on my left think more about imagery to compliment her fantastic dialogue. But I've been hard-pressed to offer any constructive suggestions for the biographer on my right."

Combining Sarah's and Pete's clues yields this arrangement:

Now we need to determine how to combine these two arrangements of people. Clearly, the female screenplay writer and the male poet cannot be the same person. This leaves five other possible arrangements, only one of which does not produce any contradictions.

This arrangement leaves one unlabeled literature genre, self-help, mentioned in the introduction to the clues.

Lastly, there are two genres who have not been associated with a person's name. However, from the conclusion, you know the names of these two people (Audrey and Victor). Since you know the poet is male, the poet must be Victor and the biographer must be Audrey.