Dang.
Well, he sure left us a legacy. Beside Dumarest, he wrote the Cap Kennedy series as Gregory Kern, a bunch of westerns under a dozen names including Eric Storm, Chuck Adams, and M.L. Powers. For those that dislike the more fantastic version of Space:1999 we got in the second season, he not only wrote the novelizations of the first season, but wrote novels that extended the story, ignored the second season, and brought the original story to a conclusion in "Earthfall."
My wife and I have really been enjoying the Dumarest series together. What adds to our enjoyment is discovering that we've been enjoying his books for years under pseudonyms.
What a life well spent.