Guy Steele is an award-winning computer scientist who is connected to TeX.

Here is the beginning of a short bio taken from Peter Seibel's book, Coders at Work, for which the author interviewed Steele.
Guy Steele is a true programming polyglot. When I asked him what
languages he has used seriously he came up with this list: COBOL,
Fortran, IBM 1130 assembly, PDP-10 machine language, APL, C, C++,
Bliss, GNAL, Common Lisp, Scheme, Maclisp, S-1 Lisp, Lisp, C, Java,
JavaScript, Tcl, Haskell, FOCAL, BASIC, TECO, and TeX. “Those would be
the main ones, I guess,” he added.
He had a hand in the creation of both of the major surviving
general-purpose Lisp dialects: Common Lisp and Scheme. He served on
the standards bodies that defined Common Lisp, Fortran, C, ECMAScript,
and Scheme and was recruited by Bill Joy to help write the official
language specification for Java. He is now at work designing Fortress,
a new language for high-performance scientific computing.
Steele’s academic career included an AB from Harvard and an SM and PhD
from MIT. While at MIT he collaborated with Gerald Sussman on a series
of papers now known as “The Lambda Papers,” which included the
original definition of the Scheme programming language. He has also
been a chronicler of hacker culture as one of the original compilers
of the Jargon File and editor of the book version, The Hacker’s
Dictionary (subsequently updated and expanded by Eric S. Raymond as
The New Hacker’s Dictionary). And he played an important role in the
birth of Emacs and was one of the first programmers to port Donald
Knuth’s program TeX.
Steele is a Fellow of the Association for Computing Machinery and the
American Academy of Arts and Sciences and a member of the U.S.
National Academy of Engineering. He won the ACM’s Grace Murray Hopper
Award in 1988 and Dr. Dobb’s Excellence in Programming Award in 2005.
(my emphasis)
Knuth himself, in the interview he gave to Seibel for the same book, describes Steele as influential in the development of TeX (see p597 in Coders at Work).
Seibel: You’ve designed some languages yourself—probably the most widely used of which is TeX.
Knuth: So TeX is a programming language but I had to put in those features
kicking and screaming. Guy Steele, Terry Winograd, Leslie Lamport, and
different people needed things when they were using TeX as a front end
for their material. I think Terry Winograd was writing a book on the
syntax of natural languages, so he had some really powerful macros
that he wanted to write in order to make the diagrams in his book.
That pushed TeX a lot towards becoming a programming language in the
earliest days.
(my emphasis)