Who We Are

The Future of Cybersecurity

GRIMM is an innovative, forward-looking cybersecurity organization led by industry experts. Our services are informed by extensive experience working with advanced threats, discovering critical vulnerabilities, and demonstrating meaningful solutions for advanced problems.

GRIMM has advanced teams facing active threats and the thinking behind them. Our expertise is built on operational experience solving the most complex cybersecurity problems.

GRIMM focuses on agency and enterprise clients from various industries, services, specialties, and sizes – including organizations from defense and national security to critical infrastructure and financial services – that require the ability to uncover security gaps and areas of exposure at every level.

Media Inquiries

For official statements and answers to your questions, please direct media inquiries to [email protected].


Making the world safer for business, democracy, and humanity by slaying unknown and undocumented vulnerabilities before they strike.


GRIMM makes the world a more secure place by increasing the cyber resiliency of our client’s systems, networks, and products.

Meet the Team

The leadership behind GRIMM combines decades of technical expertise, training development, and consulting for facing threats in your systems, networks, and deployed technologies.

Jennifer Tisdale (1)

Jennifer Tisdale


Jennifer is the CEO at GRIMM, a cyber research firm headquartered in Reston, Virginia, with a holistic approach to the cybersecurity of cyber-physical (CyPhy™) systems. She is a cyber-economics strategist recognized for building cybersecurity strategies and programs for industry, government and academia. 

Naki - Tom VanNorman

Tom VanNorman


Tom leads the CyPhy Product group at GRIMM, where his primary focus is securing Industrial Control Systems and the networking of such systems. He brings an unparalleled level of operational knowledge and experience and has been working in the Operational Technology (OT) field for almost three decades.

Naki - Matt Carpenter

Matt Carpenter

Sr. Research Principal

Matt has been reversing and exploiting embedded systems and critical infrastructure in automotive (firmware, hardware, radio) for 13 years, writing emulators and disassemblers for 15 years, and crafting tools to make it easy for just as long.

Naki - Timothy Brom

Tim Brom


Tim Brom specializes in automotive, aerospace and military cybersecurity research. He has 10+ years of experience as a software developer and security researcher focusing on automotive, aerospace, critical infrastructure and industrial control systems.

Naki Carter - Dan Fego

Dan Fego

Director, Tailored Software

Dan is a dedicated, hands-on software engineer, researcher, leader, and mentor with 12+ years of experience developing security-focused software within federal and commercial industries. He is highly skilled in leading engagements at all technical levels.

Contact grimm experts