In roughly chronological order:

- Actively contributed to [language design discussions](https://groups.google.com/g/elixir-lang-core/search?q=author%3Akeele) for over a decade
- [Enhanced](https://github.com/elixir-lang/elixir/pull/1981) some [stdlib](https://github.com/elixir-lang/elixir/pull/2414) functions [early](https://github.com/elixir-lang/elixir/pull/2412) on [in](https://github.com/elixir-lang/elixir/pull/5389) Elixir's development
- Contributed the expressive relative [Ecto migration mix tasks](https://github.com/elixir-ecto/ecto/pull/131)
- Allowed `ExUnit.Doctest` to [handle fenced code blocks](https://github.com/elixir-lang/elixir/pull/5389)
- Developed an [experimental key-value store adapter library](https://github.com/christhekeele/mnemonix), `Mnemonix`
- Started volunteering my time to help run ElixirConf US, Lonestar Elixir, and Gig City Elixir conferences since 2016
- [Implemented the `defguard`](https://github.com/elixir-lang/elixir/pull/5857) macro
- Building a [first-class match specifications library](https://github.com/christhekeele/matcha), `Matcha`
- [Improved](https://github.com/elixir-lang/elixir/pull/10689) [various](https://github.com/elixir-lang/elixir/pull/10692) [functionality](https://github.com/elixir-lang/elixir/pull/10693) around `ISO8601` support
- [Presented](https://2022.elixirconf.com/speakers/chris-keele#s) on [match specifications](https://www.youtube.com/watch?v=5cj3cqAy81M) at ElixirConf US 2022
- Gave a disastrously recursive lightning talk on [computing surreal numbers in Elixir](https://youtu.be/f1lNK5gDlwA?t=234) at ElixirConf US 2022
- Exploring a library for supercharging runtime-configuration of Elixir applications, `Plasma`
- [Proposed](https://groups.google.com/g/elixir-lang-core/c/P6VprVlRd6k), [prototyped](https://github.com/elixir-lang/elixir/compare/main...christhekeele:elixir:tagged-variable-literals), and [previewed](https://github.com/christhekeele/tagged_tuple_shorthand?tab=readme-ov-file#usage) a syntax for field punning in Elixir
- [Moderator](https://elixirforum.com/g/Section-Moderators) on the Elixir Forums since 2025