Author has written 2 stories for Cthulhu Mythos, and Zothique series.
I am a software nerd currently living in Colorado. I have written books but they are nonfiction (history of early Islam). I do love to read fiction, particularly speculative / fantastic fiction.
As far as derivative fiction -"fan" fiction as we are calling it here -I don't (usually) approve of re-using a story's characters. I am more interested in how other authors might work with such story's setting. For instance we have a glut of Conan stories, but Robert Howard's Hyborian-Age world is a large one with room for many other stories in it. The "Hyborian Adventures" books were an interesting experiment in that direction.
Derivative fiction is also handy as a critique against the original stories when they peddle a flawed or even evil message. For example Isaac Asimov's "Foundation" series is technocratic and sides with the manipulators of the Second Foundation. So I very much endorse counter-stories like Donald Kingsbury's "Psychohistorical Crisis" and Johan Kalsi's "Corroding Empire".
This all assumes they do it right. I hope my stories here do it right.