Who are Thevenin & Norton
.[SI-LIST] : Who are Thevenin and Norton? About this list Date view Thread...
...Doug Brooks: "[SI-LIST] : Who are Thevenin and Norton?" 
www.qsl.net/wb6tpu/si-list3/0392.html 
------------
This is not the complete picture but may help you on your quest: 

From Engineering Circuit Analysis by Hayt & Kemmerly, Library of Congress 
No. 62-17882, McGraw-Hill 1962,  Page 82 

"The first of these theorems is attributed to M L Thevenin, a French 
engineer working in telegraphy, who first published a statement of the 
theorem in 1883; [second source note: M. Leon Thevenin (1857-1926), 
published his theorem in 1883. ]

 the second may be considered a corollary of the first, credited to 
E.L. Norton, a scientist with the Bell Telephone Laboratories." 
[second source note: E.L Norton published his theorem in 1926, 
while working at Bell Telephone Labs. ]

Because corollaries are relatively simple mathematical devices, I personally 
doubt that the Norton attribution is naming the true originator. 
[ Does he mean Norton did NOT originate Norton's Theorem?]

There are a lot of sound engineering principles to be found in old text 
books (I used the one above at university). I recommend brousing some second 
hand bookshops if you are interested in the basics and history of engineering. 
-----------------------

Source of both second source notes above:
Joel Jorgenson, Ph.D. Assistant Professor 
Electrical and Computer Engineering 
North Dakota State University