I'm a retired pathologist in Houston, Texas, with a long interest in photography.
I am on Twitter as @euthman
Hundreds of my images, including all my medical images, have Creative Commons licenses, which allow them to be published, posted, or otherwise redistributed free of royalty obligation. If you use them, please credit "Ed Uthman." Also, I would appreciate it if you let me know by Flickr Mail where you'll be using it, so I can take a look for the sake of vanity. ;)