Thomas Daniel Jennings is a Los Angeles-based artist and computer programmer, known for his work that led to FidoNet, and for his work at Phoenix Software on MS-DOS integration and interoperability.

FidoNet is a worldwide computer network that is used for communication between bulletin board systems (BBSes). It uses a store-and-forward system to exchange private (email) and public (forum) messages between the BBSes in the network, as well as other files and protocols in some cases.