Tom Callahan is the General Manager and CTO of QRC Technologies, a provider of network-discovery cellular test and measurement tools for military and government use. Prior to establishing QRC Technologies, Callahan was Vice President of Engineering for PCTEL’s RF Solutions group, which focused on building cellular scanning receivers. He previously worked as a DSP Engineer building signal-intercept systems for Watkins–Johnson. Callahan has a BSEE and MBA. He is an expert in the air interfaces for cellular protocols and has worked in numerous roles including as a DSP, software, and systems engineer. Callahan also is a Certified Program Management Professional (PMP).