Maintainers

Subsystem ownership in rails/rails. Rails has no CODEOWNERS file; ownership is informal and derived from git history. The table below shows the most recent and most frequent contributors per component as of 2026-04-30 against main.

These names are derived from git log --format="%aN" -- <component>/ | sort | uniq -c | sort -rn. They reflect recent code work, not formal ownership. Decisions about merging or release coordination are made by the Rails core team.

Bot accounts are filtered out; the names below are humans.

Recent contributors per component

Component	Top recent contributors (last few years)	Long-time contributors
activerecord/	Jean Boussier, Hartley McGuire, Ryuta Kamizono, fatkodima, Yasuo Honda	Aaron Patterson, Rafael Mendonça França, Sean Griffin, Eileen M. Uchitelle, Ryuta Kamizono
activesupport/	Jean Boussier, Rafael Mendonça França, Hartley McGuire	Aaron Patterson, Rafael Mendonça França, Jeremy Kemper, Xavier Noria
actionpack/	Hartley McGuire, Rafael Mendonça França, Jean Boussier	Aaron Patterson, Rafael Mendonça França, Joshua Peek, José Valim
actionview/	Hartley McGuire, Jonathan Hefner, Rafael Mendonça França	David Heinemeier Hansson, Jeremy Kemper, Carlos Antonio da Silva
railties/	Jonathan Hefner, Rafael Mendonça França, Gannon McGibbon	Rafael Mendonça França, Carlos Antonio da Silva, José Valim
actionmailer/	Jonathan Hefner, Rafael Mendonça França	David Heinemeier Hansson, Jeremy Kemper
actionmailbox/	George Claghorn, Rafael Mendonça França	David Heinemeier Hansson, George Claghorn
actioncable/	George Claghorn, Rafael Mendonça França	David Heinemeier Hansson, Matthew Draper
activejob/	Jean Boussier, Rafael Mendonça França	David Heinemeier Hansson, Cristian Bica
activestorage/	George Claghorn, Rafael Mendonça França	David Heinemeier Hansson, George Claghorn
actiontext/	Jonathan Hefner, Rafael Mendonça França	David Heinemeier Hansson, Sam Stephenson
activemodel/	Hartley McGuire, Rafael Mendonça França	Rafael Mendonça França, Sean Griffin

All-time top contributors

Rafael Mendonça França     6,794
Aaron Patterson            5,311
David Heinemeier Hansson   4,647
Ryuta Kamizono             4,193
Jeremy Kemper              3,520
Xavier Noria               2,727
Jean Boussier              2,704
José Valim                 2,569
Yves Senn                  1,638
Carlos Antonio da Silva    1,622
Jonathan Hefner            1,542
Santiago Pastorino         1,352
Kasper Timm Hansen         1,330
Eileen M. Uchitelle        1,268
Sean Griffin               1,217
Guillermo Iguaran          1,117
Joshua Peek                1,102
Matthew Draper             1,059

Last-12-months active

Jean Boussier              766
Rafael Mendonça França     240
Hartley McGuire            216
Yasuo Honda                132
fatkodima                  118
zzak                       107
Ryuta Kamizono              99
Gannon McGibbon             95
Matthew Draper              85
Guillermo Iguaran           83
Jonathan Hefner             ~80
George Claghorn             ~70
Eileen M. Uchitelle         ~50

Coordination

Triage, releases, and major decisions go through the Rails core team. The current process is documented in RELEASING_RAILS.md. Discussion happens on:

• The discuss.rubyonrails.org forum.
• The #rails-contributors channel on Discord.
• GitHub issues / PR threads.

For the broader contributor community, the contributors site ranks open source contributions to the Rails ecosystem.

Note on personal data

The names above are public commit metadata. They're listed here to help readers identify the right person to ping for questions about a subsystem; they are not an authoritative ownership statement. For questions, prefer GitHub issues or the discuss forum over direct messages.