About Defy

Experienced cybersecurity leaders focused on your success

With decades in the industry, our leadership, advisors and board bring all of their cybersecurity expertise to the table to add value to our clients, vendors, and partners.

company leadership
Justin Domachowski, Founder & President of Defy

Justin Domachowski

Founder & CEO

In founding Defy, Justin brings over a decade of experience, working with some of the world’s largest financial institutions and enterprise customers while building strong relationships within the CISO community. He led the way at Accuvant and Optiv as the top performer by helping clients strategize for the future, and support their teams’ initiatives. His total focus on customers’ success grew Defy into what it is today.

Justin’s four children and wife keep him happy and busy when he’s out of the office. He also spends time serving his community and volunteering.

“I love becoming an extension of our customers’ team and showing them the real value of trust, transparency and integrity. Doing the right thing for them is the true heart of what we do.”
Jeremy Gilbert and his family

Jeremy Gilbert

SVP Operations

A Defy co-founder and 16-year veteran of the IT industry, Jeremy has substantial experience in internal operations, having held direct management roles in client operations and sales support at Optiv and Accuvant. He’s built the company’s operations department from the ground up.

Jeremy lives in his hometown of Buffalo, where he claims to love even the winters. When he’s not doting on his wife and young daughters, he’s usually watching live music or playing guitar.

“Defy is the best of both worlds for our clients. We have a boutique feel and a customer-first approach, combined with a wealth of expertise and experience behind us. That’s exactly what was needed in the marketplace.”
David Roshak and his dogs

Andrew Sullivan

Chief Financial Officer

A seasoned veteran of accounting, finance and technology, Andy has worked with a number of information security companies over the last decade, driving growth and transformative change. His experience includes Optiv Security, where after serving as the VP of Finance for Accuvant, led the systems integration of Accuvant and Fishnet, later becoming the VP of Enterprise Applications for the combined companies. In addition to his full-time commercial endeavors, Andy served eleven years as an Affiliate Faculty Member for Regis University’s Graduate School.

Andy enjoys golfing, boating and fishing. He lives with his wife and Scottish Terriers in Bradenton, Florida. Most summers find Andy on a river in the west, enjoying the company of his adult children.

“Putting the customer first while providing unparalleled insight and expertise in navigating the complicated threat landscape and solution market is the value that Defy provides… Customers can trust the commitment and experience that defines this team…”
Autumn Nesbeth

Autumn Nesbeth

Controller and Director of Human Resources

Autumn has over 20 years of experience in finance and human resources with public and private companies in various industries. She is an innovative and strategic leader with a record of transforming teams. Before joining Defy, Autumn held multiple roles addressing diverse and challenging opportunities to advance the business and grow professionally.

Kym Kaelber

Kym Kaelber

Director of Services Operations

With nearly a decade in cybersecurity operations, Kym is a super-networker and relationship-builder. She relishes delivering exceptional experiences on behalf of Defy Security customers. Whether she is working directly with customers to customize a contract or building relationships with top-tier cloud-migration consultants, Kym brings optimism and a commitment to excellence to every project and conversation.

Kym lives in Ohio, where she enjoys spending time with her family, traveling to the California coast, and having a great cup of coffee.

John Giacomini headshot

John Giacomini

A cybersecurity veteran, John Giacomini was most recently the Chief Revenue Officer of email security company Agari Data. He’s also held executive positions at endpoint security company Cylance, Forcepoint, and Bluecoat Systems (now Broadcom).

board members

Frank Young


Michael Dougherty


Justin Domachowski

President Defy Security

David Roshak

Vice Chairman

What it takes

We’re always looking for experienced and committed cybersecurity professionals who are driven to help clients and colleagues be their best. Are you ready to defy the status quo?

Why Defy?

The cybersecurity landscape is already crowded. Why create something new? Because we know that clients need more.