Erle Stanley Gardner was a prolific writer, not only did he punch out case after case for Perry Mason Mysteries but he also worked under the name A.A. Fair. Due to the popularity of his books, his covers are some of the easier to run across. If you were thinking about just choosing one writer to collect and you would get an easy start with this fellow.
Some titles are just more fun that others.
The artist of this cover is Clyde Ross. I have checked my database to see if I had any more covers by this artist and so far I haven't found any listed. That isn't to say that I dot have a few more covers by him. Often artists were not given a written credit to the artwork. Sometimes they would sign the cover or hide their signature, only to have a banner snipe of text, or some judicious cropping of the art block it out.