Guido has been a professional software developer since 1991, but started much earlier on the good old C-64. He is well known for making fun of himself and his interesting teaching skills. He also enjoys sharing his knowledge with anyone who is willing to listen or ask for help. Besides contributing (or trying to) patches for Zend Framework, Zend Expressive, and Doctrine, and being a panelist on a Zend webinar, he is always working on one PHP project or another. His specialty is PHP on the IBM i.