Read this article from Ozelwebtasarim.com

“Today most web designers do more than just design the look and feel of a web site. They often play a major part in writing the front end code. This means that a big part of the SEO or Search Engine Optimization responsibilities should fall on the designer. However, there is a large number of web designers that don’t understand this subject well enough to create a site that is fully optimized for search engines.”