Our Team

Meet the cybersecurity leaders behind our solutions

Leadership Team

To defend your business, you need the best team in your corner. At Binary Defense, our team is comprised of experienced cybersecurity leaders, including former military and intelligence agency security professionals.

Each with a unique skillset, we’re united around a single mission – to change the security industry for the better and help organizations defend against threats of all kinds.


Co-Founder & Chief Executive officer

Mike Valentine

As CEO of Binary Defense, Mike Valentine provides the strategic direction and execution of our cornerstone solutions of MDR, SIEM and Counterintelligence, as well as helps to ensure client satisfaction.


Co-Founder & Chief technology officer

Dave Kennedy

Our Co-Founder and Chief Technology Officer Dave Kennedy is a world-renowned security expert. Through his work with Binary Defense and our sister company, TrustedSec, he’s transforming the cybersecurity industry.

Meet the Binary Defense Team

Ryan Burnheimer

Vice President of Business Development
Ryan Burnheimer is the Vice President of Business Development and one of the founders of Binary Defense in 2014. He also serves in a similar role at…

Dave DeSimone

Chief Security Officer
Dave DeSimone is Chief Security Officer at Binary Defense, responsible for IT Operations and Security for the organization. He has been with the company since 2015. He has…

Mike Hofherr

Chief Operating Officer/Chief Financial Officer
Mike Hofherr is Binary Defense’s Chief Operating Officer/Chief Financial Officer. He has been in the CFO role since 2019 and was named COO in 2020. In this…

Jack Jackson

Vice President of Worldwide Channel Sales
Jack Jackson joined Binary Defense at the end of 2019 as the Vice President of Worldwide Channel Sales. In this role, Jack is responsible for the growth…

Nicole Serapilio

Vice President of Sales
Nicole Lieberman Serapilio is the Vice President of Sales at Binary Defense. She joined in 2017 and is responsible for building a top performing sales organization through…

Randy Pargman

Senior Director of Threat Hunting & Counterintelligence
Randy Pargman is the Senior Director of Threat Hunting and Counterintelligence at Binary Defense. In this role, Randy leads the Threat Hunting team in reverse engineering malware…

Michele Maffei

Director of Administration
Michele Maffei is the Director of Administration with Binary Defense and has been with the company since 2014. In this capacity, she is responsible for payroll, insurance,…

Christie Henderson

Director of Human Resources
Christie Henderson is the Director of Human Resources for Binary Defense, joining the organization in 2020. In this capacity she is responsible for supporting company strategic objectives;…

David White

Director of Marketing
David White joined Binary Defense in 2019 as Director of Marketing. In this capacity, David leads the multidisciplinary marketing team and determines branding…

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Dave Kennedy


Dave Kennedy is on a mission to advance the cybersecurity industry on a global scale. As Binary Defense Co-Founder and Chief Technology Officer, his experience and expertise guide our cybersecurity solutions, including the development of our proprietary managed detection and response technology.

Named one of the Top 10 IT Security Influencers in the World by CISO Platform, Dave has more than 15 years of experience in the security industry.

Prior to forming Binary Defense, Dave founded TrustedSec , an information security consulting company located in Strongsville, Ohio, which specializes in attack simulations with a focus on strategic risk-management.

Dave previously worked as chief security officer for Diebold Incorporated, an international Fortune 1000 company, where he developed a global security program that handled all aspects of information security and risk management.

Before his work in the private sector, Dave served in the United States Marine Corps including two tours in Iraq. He specialized in cyberwarfare and forensics analysis activities for the U.S. intelligence community.

Education & Certifications


Industry Contributions

As an author and creator of several open-source tools, Dave has made his mark on the cybersecurity industry. He was a founding member of the Penetration Testing Execution Standard, which has been adopted by the Payment Card Industry and the Data Security Standard Guidelines for Penetration Testing. His other industry contributions include:

  • Co-Author of Metasploit: The Penetration Tester’s Guide
  • Co-Creator of the Penetration Testing Execution Standard
  • Creator of the Social Engineer Toolkit
  • Creator of the PenTesters Framework
  • Creator of the Magic Unicorn Exploitation Framework
  • Creator of Artillery
  • Creator of Fast-Track

Public Appearances & Media

Dave has appeared as a guest on multiple news networks including Fox News, CNN and MSNBC. His tools have been featured on the History Channel and the popular USA Network television series Mr. Robot, where he also assisted with content.

As a recognized leader in the industry, Dave has presented at international security conferences including Microsoft’s Bluehat, DEF CON, Blackhat and Grace Hopper. He is also the co-founder of DerbyCon, a large-scale security conference based in Louisville, Kentucky.