Motanum is a level designer for mainly Zombie Escape and Portal 2, although he has done work for Left 4 Dead 2, Half-life 2, and Team Fortress 2. He has released Aperture Tag with the Aperture Tag Team and is currently working on an unnamed project with JorisCeoen for the Unreal Engine 4.
Although he is currently working on an unnamed project, he plans to make a return for Counter-Strike: Global Offensive, updating the existing maps and creating new maps for the zombie escape mod. If sufficient people ask for an update on any map, he might squeeze out some of his time to work on it.
You can check his website for updates on his work. You can also contact him via email: firstname.lastname@example.org. You can use it to report a bug, make an offer, suggestions or simply to greet.