About Zend

I stole this from the company web site. You can check Zend out for yourself at http://www.zend.com/.

Zend: The PHP Company
Businesses utilizing PHP know Zend as the place to go for PHP expertise and sound technology solutions. Zend's founders Andi Gutmans and Zeev Suraski are key contributors to PHP and the creators of the core PHP scripting engine, the Zend Engine. Because of their internationally recognized expertise, the company continues to provide important leadership for PHP and other open source communities, and plays a central role in the explosive growth of PHP.