John Blackbourn (@johnbillion) – WordPress user profile

Bio

I’m one of the team of WordPress core developers. I was the release lead for WordPress 4.1 and 4.9.1. I work as the Director of WordPress Security at Human Made and I’m the WordPress core security team lead.

Previously I’ve worked at Code For The People and WordPress.com VIP.

Badges

CODE

6 badges

Core Contributor '15 Core Team '15 Meta Contributor '15 Plugin Developer Security Contributor '22 Security Team '22

CONTENT

1 badge

Documentation Contributor '17

COMMUNITY

5 badges

bbPress Contributor '19 B BuddyPress Contributor '19 Meetup Organizer '18 WordCamp Organizer '20 WordCamp Speaker '19

PRACTICE

2 badges

Accessibility Contributor '19 Support Contributor '26

POLYGLOTS

1 badge

Translation Contributor '15

Current Job

Present

Human Made Ltd

Recent impact

Score weights high-impact work (commits, releases, approved translations, props) at 3x routine activity.

Last 30 days

47contributions

high34

medium13

score115

Last 90 days

150contributions

high76

medium74

score302

Last 12 months

912contributions

high543

medium369

score1998

Team focus

Share of contributions across teams during the last 365 days

WordPress releases

Contributed to 38 releases

Time commitment

16 hours per week of sponsored contribution time

Human Made

Contributions

Type

June 2026

Jun 10 Wed · 18:14

Meta high

Made 2 updates to handbook pages on Making WordPress Secure.

Jun 10 Wed · 16:51

Meta high

Made 4 updates to handbook pages on WordPress Developer Resources.

Jun 09 Tue · 21:44

Meta med

Created ticket #8290 on Meta Trac:
wp-trac mailing list has stalled

Jun 09 Tue · 21:17

Forums med

Posted a reply to Users without ‘edit_users’ can switch roles, on the site WordPress.org Forums:
A user can only switch to another user if they have the ability to edit…

Jun 09 Tue · 08:40

GitHub high

Pull request #646 merged into wp-cli/handbook:
Introduce a Security Vulnerability Reporting page

Jun 08 Mon · 22:38

GitHub med

Submitted pull request #646 to wp-cli/handbook:
Introduce a Security Vulnerability Reporting page

Jun 03 Wed · 09:36

Forums med

Posted a reply to Switch role, on the site WordPress.org Forums:
Thanks for the message. When you switch between users with User Switching, you genuinely get…

May 2026

May 31 Sun · 19:19

Core high

Mentioned in [62437] on WordPress SVN:
Privacy: Correct type of `WP_User_Request::$user_id` from `int` to `string`/`numeric-string`.

May 29 Fri · 11:10

Core high

Pushed 1 commit to WordPress/WordPress:
Docs: Remove duplicate documentation for the `rest_block_hooks_post_types` hook.

May 29 Fri · 11:07

Core high

Committed [62430] to WordPress SVN:
Docs: Remove duplicate documentation for the `rest_block_hooks_post_types` hook.