Key points
- Ellen Sundra is promoted to Chief Customer Officer at Horizon3.
- She oversees six customer-facing teams including sales engineering and support.
- The move aims to improve adoption and security outcomes for NodeZero.
Horizon3 has promoted Ellen Sundra to Chief Customer Officer, a role that unifies six customer-facing teams under her leadership to drive better security outcomes for NodeZero users.
How it unfolded
- On October 14, 2026, Horizon3 announced the promotion of Ellen Sundra from Vice President of Customers to Chief Customer Officer.
- Sundra’s new responsibilities include overseeing Sales Engineering, Customer Success, Support, Enablement, Renewals and Field CTOs.
- The company stated the move connects pre-sales guidance with post-sales support to help customers achieve measurable results with NodeZero.
Who is affected
Sundra’s expanded remit brings six distinct functions under her direct leadership. According to the company, this structure is designed to help customers realize value faster and deepen their adoption of the NodeZero platform. The promotion recognizes Sundra’s role in combining technical expertise with customer advocacy across these teams.
Sundra joined Horizon3 in December 2024. Before this appointment, she spent nearly 15 years at Forescout, where she advanced from Federal Systems Engineer to Chief Customer Officer. Her background includes building customer-focused teams and working with practitioners, executives and boards.
Snehal Antani, CEO and co-founder of Horizon3, said Sundra’s technical expertise and customer empathy helped the company cultivate strong advocates. Antani noted that Sundra helped build processes to scale support for more than 7,000 companies that rely on Horizon3 for cyber resilience.
What happens next
Sundra’s organization will help customers use NodeZero’s evidence through repeatable testing, informed remediation and verification. The goal is to expand platform use as security needs evolve. Sundra said her focus is on helping teams become confident users who can turn findings into verified fixes.
Horizon3 describes NodeZero as an AI-Native Proactive Security Platform that safely proves which exposures attackers can exploit. The platform tests defenses at machine speed, uncovers exploitable attack paths and verifies fixes. More than 7,000 organizations, including defense agencies and Fortune 10 enterprises, use the tool.
The background in plain language
Customer success roles bridge the gap between selling software and helping users get value from it. In security, this means guiding teams from initial setup to ongoing use. Leaders in this space ensure that technical support, training and renewal processes align. This alignment helps organizations maintain security posture over time. Teams usually rely on these leaders to translate complex tool outputs into actionable steps for their staff.
What to do and how to stay safe: Horizon3
- Review how your organization currently handles support and training for security tools.
- Identify gaps between pre-sales promises and post-sales reality in your workflows.
- Ensure your security teams have clear paths to verify that fixes actually close risks.
- Monitor how vendor leadership changes might affect your account management and support channels.
Step-by-step guide: Mobile Device Security for Small Business: Control Without Cost
General security guidance from the Circuit Observer newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What role did Ellen Sundra hold before becoming CCO?
She was the Vice President of Customers at Horizon3.
Which teams does Sundra now oversee?
She oversees Sales Engineering, Customer Success, Support, Enablement, Renewals and Field CTOs.
When did Sundra join Horizon3?
She joined the company in December 2024.
