Vosla does some arts (comic) and voice acting (german & english). Otherwise he is quite unremarkable except for the amounts of Cola and pizza he consumes.
Another installment of the big map in Half-Life, looking down from a roof top. Massive outdoor maps are not exactly what Half-Life was made for. If you are a really good mapper, you can create the illusion of open maps. See the mod Paranoia for some examples.