Dave Eisner
Founder
Dave brings more than 30 years of information-technology experience spanning hands-on system work, troubleshooting, enterprise support, IT leadership, help desk management, and strategic consulting. He founded The PC Whisperer in Denver in 2008 and expanded that work into One Call Networks in 2019, building a broader team around networking, cybersecurity, and small-business IT.
After relocating to Northern Michigan in 2022, Dave expanded One Call Networks into the region while continuing to support clients through the company’s “One call to solve them all” approach.
Shawn Struve
IT & Cybersecurity Professional
Shawn brings a security-first approach to technical support, backed by CompTIA A+, Network+, Security+, and CySA+ certifications, with PenTest+ currently in progress. Her hands-on experience includes Windows and Linux systems, server administration, hardware diagnostics, network troubleshooting, firewall rules, access controls, traffic monitoring, and virtualization.
Her security background includes threat analysis, vulnerability assessment, network defense, SIEM concepts, Wireshark, Nmap, Metasploit, and practical offensive and defensive skills developed through cybersecurity communities and Capture the Flag exercises. She also brings strong documentation, problem-solving, and client-support skills to the team.
Brock Potvin
Field Technician
Brock brings more than 11 years of hands-on experience in network engineering and enterprise telephony systems, including fiber design, installation, splicing, optical testing, underground cabling engineering, and project management.
His experience includes Cisco Catalyst network administration along with CompTIA Network+ and Cisco Meraki Wi-Fi training. Brock’s field-driven approach helps clients build stable, scalable network infrastructure that supports long-term growth.
Ricardo Flores
Field Technician
Ricardo is a CompTIA A+ certified IT professional with strong experience in field service, desktop support, and hardware and software troubleshooting. He performs onsite diagnostics and repairs across business, government, and education environments while maintaining strong service and customer-support standards.
His background includes Tier 1 and Tier 2 support, system installations, Microsoft 365 environments, Cisco Meraki devices, and basic server infrastructure. Fluent in Spanish, Ricardo combines hands-on troubleshooting with clear client communication.
