Cal Evans

Cal, also known as the godfather of PHP, is an often seen guest at conferences. He's worked for many companies in a position that somehow included contact with the PHP community best, well, Cal is the community.

Oleksii Gopachenko

Oleksii is the lead of the PHPStorm project for Jetbrains, and responsible for the fact that all PHP developers can work so efficiently.

Chris Riley

Chris is a freelance consultant from the UK and also organizes PHP Yorkshire.

Joop Lammerts

Joop works for Procurious and also does training and speaking on subjects such as DDD and event storming.