Wall immediately began working in the video game industry, composing the soundtrack to "Vigilance". Primarily composing in an orchestral style, by 2001 he composed the soundtrack to ', which was the title he says put him on the map as a video game composer. In 2002, Wall became one of around 20 co-founders of the Game Audio Network Guild (G.A.N.G.) as well as senior director. In 2005, Wall, along with G.A.N.G. founder and fellow composer Tommy Tallarico, produced the Video Games Live concert series, having served as the conductor for the international concert tour. His latest released soundtrack is that of 2020's "Black Ops Cold War". His soundtracks for "Myst III: Exile", ', "Rise of the Kasai", "Jade Empire", "Mass Effect", and "Mass Effect 2" were nominated for and won multiple awards.