Ryan has been a contributor to WordPress for the past 17 years, and is responsible for key components in it. He created and lead the WordPress REST API project for over 4 years, culminating in it successfully being integrated into the WordPress project. He also created Requests (the HTTP library used by WordPress), maintained SimplePie (the Atom/RSS library), and worked on many improvements as part of the security team, including an embedded interpreter for a C-like language.