Michael Shapiro (also known as Mike Shapiro) is, besides his work with the Half-Life games, also known for additional work with other computer games, television shows and is an acclaimed theatre director. Character voices in Half-Life, Half-Life: Opposing Force and Half-Life: Blue Shift:
- Barney Calhoun
- Otis
- G-Man
- Nihilanth
- HECU Soldiers
- Black Mesa Scientists
- Male Black Ops
- Barney Calhoun
- G-Man
