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I've just read on The New York Times's article on Knuth The Yoda of Silicon Valley that his wife, Jill, is a graphic designer.
Did she have a role in creating Knuth's TeX computer typesetting system?
Of course, the question is extended to the complete project: TeX, METAFONT, Computer Modern, ...
I don't know of any text that mentions Jill's help for the TeX language, the implementation, etc. But if the question is extended to the complete project TeX, METAFONT, and Computer Modern her help is documented.
Besides all the support that she gave Donald Knuth in their relationship---the NYT article mentions that he starts to be active at night, sleeping during the day; what does that mean for the partner?---he mentions a couple of times in his papers her contributions.
First in the article based on his his Gibbs lecture of 1978, in which he talked about his research in Mathematical Typography. The section Acknowledgments starts with the words
I would like to thank my wife Jill for the many important suggestions she made to me during critical stages of this research
(page 59 in Digital Typography (DT)). Earlier in this article he wrote
With my wife's assistance, I finally came up with a satisfactory solution
In this part he discusses the problem to draw the letter `S'; page 48 in DT.
On page 64 of the book Companion to the Papers of Donald Knuth he says
Jill helped me at this point: She took 35mm slides of the master pages that I'd gotten from Addison-Wesley
That was an early stage, in which he tries to get the letter forms used in his books The Art of Computer Programming.
plain) is something for recipes, designed with her input and for her to use (see "Recipes and Fractions" and "Macros for Jill" by DEK in TUGboat) -- some more of TeX's features came about from such applications (contd) – ShreevatsaR Dec 19 '18 at 18:20