Guy Lewis Steele Jr. is an American computer scientist who has played an important role in designing and documenting several computer programming languages and technical standards.

Tartan Laboratories, Inc., later renamed Tartan, Inc., was an American software company founded in 1981 and based in Pittsburgh, Pennsylvania, that specialized in programming language compilers, especially for the language Ada. It was based on work initially done at Carnegie Mellon University and gradually shifted from a focus on research and contract work to being more product-oriented. It was sold to Texas Instruments in 1996. Part of it was later acquired by DDC-I in 1998.