If the author is pleased with their agent's performance, then that's a good indication that you can feel confident in approaching them for representation. Unagented authors can also be a great resource in your agent quest. However, do bear in mind that unagented authors could lead you astray. For instance, if they've been rejected by a particular agency, they may feel embittered for no particular reason, and thus give you an inaccurate impression of an agent you might really enjoy working with. A second and very important way to meet good agents is at writers conferences.
Most agents attend a variety of conferences every year in hopes of finding new, talented authors.
Conferences allow you to meet agents in person, which gives you the advantage of personal contact when submission time comes, and also allows you to see if you connect with that agent. Create a target list of agents Another way to proceed in the agent hunt is to simply create a target list of agents who handle your type of material. This list can be formed from a variety of resources, such as the Literary Marketplace, the Writers Digest Guide to Literary Agents, the Internet Directory of Literary Agents, and such. So long as these agents aren't charging any upfront reading or marketing fees, then query them about your project. If after reading your manuscript they offer you representation, let them know that you're delighted by their interest, but would like to ask them a few questions.