David Clark is an engineer interested in how things work, and enjoys sharing what he learns. He's been working with radio technology since the late 1980s and was using SDRs before they were cool.

Paul Clark is the owner and chief engineer at Factoria Labs, an organization dedicated to the propagation of software-defined radio. He has experience ranging from chip design to firmware development to RF reverse engineering. He teaches classes and workshops on SDR in the U.S. and abroad.