Peter-Paul Koch is a mobile platform strategist, browser researcher, consultant, and trainer in Amsterdam, the Netherlands. He specialises in the mobile web, and especially mobile browser research. On the Web he’s universally known as ppk.

He won international renown with his browser compatibility research, founded Fronteers, the Dutch association of front-end professionals, and advises mobile and desktop browser vendors on their implementation of Web standards.

Meanwhile he concentrates on the mobile web, and then especially on the aspects he feels web developers are ignoring, such as the UC browser and Xiaomi and Micromax devices. His personal collection consists of about 50 mobile phones, and he uses about half of them in his daily testing. Occasionally one of them emits a soft, melancholy beep, but he has no idea which one and studiously ignores it.