David Hobby is an American photographer and is the author of the Strobist.com lighting blog, a site which promotes lighting techniques — such as off-camera flash — among photographic enthusiasts, often with an emphasis on the practical knowledge rather than the gear. The blog is no longer updated but at one time had an on-line monthly readership of over 300,000 photographers from 175 countries, and was named one of the "25 Best Blogs of 2010" by Time magazine.