KeenRush was an administrator of the Public Commander Keen Forum but resigned because of not having the time and energy.
Author of the first Keen mod ever, Yorphius II. My other released mods are Episode Smile, which is quite notorious, and A New Dope, much easier than ES, but what I've heard, still difficult. And more recently, Fall Up, which is more experimental and puzzle-oriented than my previous mods. Then Commander Keen: Extinction, which is again rather experimental and puzzle-oriented (but features all-new enemies, their code written from scratch). My latest is The Fastest Gun In The Universe. Tip: I've heard using a DosBox with savestates will help a lot in playing these mods! I've also done some level packs (which are quite difficult as well) and participated in random Keen projects over the years. But my focus lies on modding, Keen 1 most of the time. I have several projects going on but only time will tell if anything gets completed again.
I don't have a Keen site like in the past but I have a small page for my own Keen projects (the page needs proper updating): http://keenrush.shikadi.net/