Mark's writings on topics ranging from URIs to substance abuse captivated me and helped to shape my own opinions. Some of the earliest posts on this blog mention him by name. "Me, but you, but me" (the "25 year friend" essay) is frequently on my mind, haunting and heartbreaking. Find it, if you have the means.
The Internet was better with you in it, Mark. Hope you're OK, whatever the circumstances.