Marc Hannah ( 1956-Present)
What He Invented: 3-D Graphics Technology Used in Films.
Why It?s Important: Anyone awed by the special effects in the films Jurassic Park, Terminator 2 and The Abyss should thank Chicago-native Marc Hannah. The computer scientist is one of the founders, in 1982, of the software firm Silicon Graphics (now SGI), where the special-effects genius developed 3-D graphics technology that would be used in many Hollywood movies.