Managed Detection Response
DeepSeas provides 24/7 detection and response across endpoint, network, cloud, identity, email, SaaS, and operational technology environments using existing security tools.
DeepSeas delivers expert-led cybersecurity in San Jose, CA, helping organizations detect threats, reduce exposure, strengthen compliance, and respond with confidence. From managed detection and response to penetration testing, risk assessments, vCISO guidance, and GRC support, our customized services help technology-driven and regulated organizations build measurable cyber resilience without replacing the tools they already use.
Integrated cybersecurity services help San Jose organizations prevent, detect, investigate, and manage evolving digital threats.
DeepSeas provides 24/7 detection and response across endpoint, network, cloud, identity, email, SaaS, and operational technology environments using existing security tools.
Assessments identify strengths, weaknesses, and prioritized risks through stakeholder interviews, asset inventory, risk workshops, and documented treatment planning.
Ethical hackers conduct manual penetration testing and adversary simulations across networks, cloud environments, applications, APIs, and other attack surfaces.
Continuous exposure management discovers external assets, leaked credentials, vulnerabilities, and attack paths, prioritizing the issues most likely to create business risk.
DeepSeas designs and operates compliance programs with control mapping, evidence packaging, continuous monitoring, and support for audit and regulatory requirements.
Senior advisors and virtual CISOs help leaders build security roadmaps, improve governance, prepare for board conversations, and align cyber risk with business priorities.
San Jose organizations often manage complex technology environments, distributed teams, and demanding customer or regulatory expectations. DeepSeas combines managed detection and response, offensive security, threat intelligence, advisory, and GRC into a coordinated program. Our experts work with the tools you already own, connect technical findings to business priorities, and provide measurable guidance for reducing exposure and improving resilience.
DeepSeas helps organizations worldwide turn complex cyber risk into measurable, actionable security outcomes.
"In cybersecurity we were not looking for a vendor, we were looking for a trusted partner that could push us, challenge us, and ensure we got better at protecting our systems every day. We found that partner with DeepSeas, and they have helped us be far smarter and better than..."
DeepSeas combines experienced practitioners, integrated capabilities, and practical guidance for organizations seeking measurable cybersecurity outcomes.
DeepSeas brings approximately 30 years of cyber defense experience serving organizations worldwide.
24/7 monitoring, detection, and response supports San Jose organizations across changing threat conditions.
One partner connects advisory, offensive security, intelligence, MDR, SOC, and GRC capabilities.
Bring-your-own-stack support works with existing SIEM, EDR, and CNAPP tools instead of forcing replacement.
Experienced cybersecurity practitioners guide strategy, operations, risk, and compliance.
Chief Executive Officer
Lewie Dunsworth serves as Chief Executive Officer of DeepSeas, leading the company's mission to make cybersecurity a strategic advantage for nearly 1,000 organizations worldwide. Under his leadership, DeepSeas has grown into a recognized leader in Managed Detection and Response, earning recognition from Gartner and Frost & Sullivan as a top provider in the industry. Lewie drives the company's vision across its six-layer cyber defense stack, spanning strategic advisory, offensive security, threat intelligence, managed detection and response, the CyberFusion SOC, and governance, risk and compliance. He is committed to ensuring that enterprise, mid-market, government, and education clients receive proactive, measurable, and customized cybersecurity outcomes. Lewie's leadership reflects nearly three decades of industry experience and a steadfast focus on client trust and operational excellence.
CISM, CIPP/E, SANS GCIH, GIAC, HITRUST
Keith Robertson brings 25 years of governance, risk management, and compliance experience to DeepSeas, including prior service as a Fortune 500 Chief Security Officer and Enterprise Risk Officer. He holds an impressive array of certifications, including CISM, CIPP/E, SANS GCIH, GIAC, and HITRUST, reflecting his comprehensive expertise across security management, privacy, incident handling, and healthcare compliance. Keith's executive-level experience gives him a unique perspective on enterprise risk, allowing him to help DeepSeas clients align cybersecurity strategy with broader business objectives. His background in high-stakes corporate security leadership positions him well to guide organizations through complex governance challenges and regulatory requirements. Keith is committed to helping clients build mature, enterprise-grade risk management programs that support long-term security and compliance success across diverse industries.
CISSP, CCSK, Licensed Attorney
Sean Duffy combines 25 years of cybersecurity experience with a unique legal background, holding both CISSP and CCSK certifications as well as a license to practice law. A United States Navy veteran, Sean brings a disciplined, mission-focused approach to his work advising C-suite executives and boards of directors on cybersecurity strategy and risk. His legal expertise allows him to provide clients with a nuanced understanding of regulatory and liability considerations alongside technical security guidance, a combination that is especially valuable for organizations navigating complex compliance landscapes. Sean's extensive advisory experience makes him a trusted voice for senior leadership teams seeking to understand cybersecurity risk in business terms. His military background and legal training reflect the depth and diversity of expertise that defines the DeepSeas team.
CISSP, HITRUST
Matt Lammers is an experienced CISO and IT risk executive who brings both deep technical certification and management consulting experience to DeepSeas. Holding CISSP and HITRUST credentials, Matt has built a career helping organizations strengthen their cybersecurity posture while managing enterprise-level risk. His consulting background equips him with strong skills in translating complex security concepts into actionable business strategies for executive stakeholders. Matt's international perspective, including his status as an Australia permanent resident, gives him valuable insight into global compliance and security considerations that benefit DeepSeas clients operating across borders. He is dedicated to helping organizations build resilient, well-governed cybersecurity programs that align with both operational needs and executive priorities, reinforcing DeepSeas' commitment to customized, outcome-driven security solutions.
DeepSeas provides managed detection and response, endpoint and network monitoring, penetration testing, exposure management, vulnerability management, cybersecurity risk assessments, incident response, GRC, compliance readiness, strategic advisory, and virtual CISO support. Services can be combined into a coordinated program or selected individually based on your organization’s risks, existing tools, governance needs, and operational priorities.
Talk with DeepSeas about your risks, priorities, and security goals.
Held by DeepSeas specialists.
2023 recognition as a top 40 provider.
2024 Leader and top-five provider recognition.
2024 Competitive Strategy Leadership Award.
2024 award for strategy.
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