In this episode of Inside the Network, we sit down with Sumit Dhawan, CEO of Proofpoint, one of the largest private cybersecurity companies in the world. With over $2 billion in ARR, Proofpoint protects 85 of the Fortune 100 and is on a bold path toward $5 billion in revenue by 2030.

Sumit’s journey is a masterclass in modern leadership. Having graduated with degrees in engineering and business from IIT Roorkee, the University of Minnesota, and the University of Florida, Sumit led major business lines at Citrix and VMware, including overseeing VMware’s $70 billion divestiture to Broadcom, before making the leap to cybersecurity. In 2023, he joined Proofpoint as CEO and began executing an ambitious strategy: consolidate the sprawl of human-centric security, go deep instead of broad, and prepare the company for its next chapter of growth.

In our conversation, Sumit shares why he believes empathy is the most underrated CEO trait, how acting like a founder, even inside large enterprises, shaped his leadership, and what it means to have “Apple Watch governance” under Thoma Bravo. He explains how Proofpoint has evolved from email security leader to a broader platform for human and data protection, including its acquisitions of Tessian (AI-native email protection), Hornetsecurity (MSP-focused email security), and Normalyze (DSPM).

Sumit also pulls back the curtain on the AI threat landscape, including how prompt injection attacks are already targeting copilots and agents, why AI is both supercharging attackers and empowering defenders, and how Proofpoint built intent-based detection models to defend against sophisticated zero-link phishing. Finally, he lays out three categories of viable cybersecurity startups today: gap-fillers, AI defenders, and category disruptors, and why the last two are more likely to be successful.

Whether you’re scaling a cyber startup, selling into the enterprise, or navigating PE-backed growth, this episode is full of hard-earned wisdom from a leader who’s operated at every level of the stack.

Sumit Dhawan: Leading Proofpoint’s AI evolution and building toward $5B in ARR