[Elecraft] John G's? name re external amp?

[nz7c at cox.net]

Hi - 
I'm trying to find the other article in addition to Lyle's about using the KPA100 externally but I cannot remember the author's correct spelling of the last name. It's something like John "Grebencamp" - I do apologize in advance to John about this question :-) I recall that he is quite a contributer to Elecraft technical articles.
Thanks.
Tim NZ7C