User:Simplex~enwiki

Jack (John) Perry.

Userboxes

Oh no: this user has way too many userboxes.

Wikipedia:Babel

en

This user is a native speaker of the English language.

it-3

Questo utente può contribuire con un livello avanzato di italiano.

la-1

Hic usor simplici latinitate contribuere potest.

Cyrl-3
Д

This user has an advanced understanding of the Cyrillic script.

Y'all

This here user talks Southern, y'all.

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LotH

This user prays the Liturgy of the Hours

e^{i\pi \ }

This user is a mathematician.

This user contributes with Fedora Linux.

This user has programmed in Ada

C-3

This user is an advanced C programmer.

C++-2

This user is an intermediate C++ programmer.

Eiffel-3

This user is an advanced Eiffel programmer.

js-1

This user is a beginning JavaScript programmer.

Java-2

This user is an intermediate Java programmer.

Kotlin-2

This user is an intermediate Kotlin programmer.

m2-2

This user is an intermediate Modula-2 programmer.

This user has programmed in Modula-3

ob-2

This user is an intermediate Oberon programmer.

pa-2

This user is an intermediate Pascal programmer.

Perl-1

This user is a beginning Perl programmer.

PHP-0

This user does not understand PHP, or understands it with considerable difficulties, or does not want to program in PHP.

py-3

This user is an advanced Python programmer.

This user can program in Rust.

Sage

This user is a Sage user.

css-1

This user is a beginning Cascading Style Sheets user.

HTML-2

This user is an intermediate HTML user.

This user uses LaTeX and admires its power.

This user can write in Markdown.

This user is on Stack Overflow.

This user has an account on GitHub.

TCP/IP

The user was active on the Internet before the World Wide Web was invented.

WWW

This user has posted to Usenet newsgroups.

OWN

This user uses an email account with his own domain name.

This user uses DuckDuckGo because they don't want their searches to be tracked.

This user prefers Margherita pizza, also known as Cheese pizza in America.

This user believes that userbox politics is not allowed apart from pineapple pizza advocacy.

This user plays chess.

This user knows that Pope Pius XII may have saved 700,000 lives during World War II.

This user thinks Ronald Reagan was an excellent president.

This user likes
St. Thomas Aquinas.

This user has published peer-reviewed articles in academic journals.

This user prays.

This user knows basic
chant theory.

This user enjoys sacred music.

This user is a Roman Catholic.

ʍ

This user pronounces "wh" as a voiceless labial–velar fricative

Interests: Italian and Byzantine history, Catholic theology, literature, mathematics, not necessarily in that order.

Among the articles to which he has made substantive contributions:

Formia
Gaeta
Ponza
Amiga
Canonical hours (although this was before he got an account)
Latin Psalters (to which he contributed the schema of Pope St. Pius V)
Gröbner basis
Buchberger's algorithm
Maze generation algorithm (to which he contributed the recursive division algorithm)

The reader may notice that three of those are about Italy. There's a reason for that: his mother is from Gaeta, and Jack has visited Gaeta many times, Formia several times and Ponza once.

Jack has made various minor contributions to other pages (cleaning up English, for example) and may contribute to other articles as time and interest permit.

Professionally, he is a mathematician, who has taught at the high-school and university levels, and who researches computer algebra - in particular, "combinatorial criteria for Gröbner bases," which is a lot more fun than it probably sounds.