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

36contributions

high25

medium11

score86

Last 90 days

148contributions

high75

medium73

score298

Last 12 months

887contributions

high523

medium364

score1933

Team focus

Share of contributions across teams during the last 365 days

WordPress releases

Contributed to 39 releases

Time commitment

16 hours per week of sponsored contribution time

Human Made

Contributions

Type

June 2026

Jun 20 Sat · 20:25

Forums med

Posted a reply to The transparent background color of the QM window, on the site WordPress.org Forums:
This has been fixed in QM 4.0.7. I won’t be able to support Chrome <…

Jun 20 Sat · 20:24

Forums med

Posted a reply to Please bring back number of warnings, errors., on the site WordPress.org Forums:
This has been fixed in QM 4.0.7. Thanks for the message!

Jun 20 Sat · 20:23

Forums med

Posted a reply to CSS Rendering Issue: Missing fallback for light-dark() causes transparent backgr, on the site WordPress.org Forums:
This has been fixed in QM 4.0.7. I won't be able to support Chrome <…

Jun 13 Sat · 11:26

Forums med

Posted a reply to CSS Rendering Issue: Missing fallback for light-dark() causes transparent backgr, on the site WordPress.org Forums:
There's been one other report of this and I couldn't figure out the cause. I'll…

Jun 12 Fri · 23:42

Core high

Mentioned in [62497] on WordPress SVN:
Docs: Correct the DocBlock for `build_query().`

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