When Kevin Rubin arrived at Zscaler in May 2025, he joined an established organization following the retirement of the company’s longtime CFO, taking responsibility for continuing the work of a finance leader who had already built a strong foundation. Rubin describes stepping into a business with scale, experienced leadership, and a customer base that included some of the world’s largest enterprises, he tells us.

In explaining what Zscaler does, Rubin walks through the company’s core idea: zero trust. Traditional cybersecurity, he says, relied on network-centric “castles and moats,” requiring large amounts of equipment to connect people, applications, and data. Zscaler challenged that model by treating the internet as a “superhighway” and applying a principle of minimal access. If an employee wants to use Salesforce or email, Rubin explains, the system first authenticates the user and then limits access to only what that person is authorized to see, he tells us.

Zscaler was founded in 2007 and went public in 2018, Rubin tells us. Today, roughly 40 percent of the Global 2000 and about 45 percent of the Fortune 500 use the company’s platform. Rubin attributes that adoption to a model that delivers security with less overhead and infrastructure than traditional approaches, he tells us. At its core, he says, cybersecurity comes down to two problems: stopping malicious activity from entering the network and preventing sensitive data from leaving it.

Reflecting on his first 100 days, Rubin says the transition was shaped by continuity and people. He describes a welcoming executive team and an organization already positioned for growth. Cybersecurity, he notes, remains a dynamic market, with new vulnerabilities constantly emerging, and staying ahead of those threats continues to define the work ahead, Rubin tells us.

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