Managed Detection Response
DeepSeas MDR provides 24/7 detection and response across endpoint, network, cloud, identity, email, SaaS, and OT environments, using your existing security tools.
Compare the capabilities that define leading IT security service companies in 2026. DeepSeas delivers complete cyber defense through managed detection and response, offensive security, threat intelligence, governance, risk and compliance, and strategic advisory. With nearly 30 years of experience serving organizations worldwide, its expert-led approach helps security teams identify risk earlier, respond decisively, and demonstrate measurable outcomes.
Integrated cybersecurity services that help organizations monitor, test, govern, and improve their security programs.
DeepSeas MDR provides 24/7 detection and response across endpoint, network, cloud, identity, email, SaaS, and OT environments, using your existing security tools.
Controlled attack simulations and penetration testing use real attacker tradecraft to expose weaknesses in networks, applications, cloud environments, and security controls.
Continuous external attack surface monitoring, dark web intelligence, and vulnerability prioritization help identify where your organization is most likely to be compromised.
Strategic advisors and vCISO support help leaders align cybersecurity strategy, governance, risk management, executive reporting, and security investment with business priorities.
GRC services support policy development, control monitoring, evidence organization, risk treatment, and readiness for standards including ISO 27001, SOC 2, CMMC, PCI DSS, and NIST.
Incident response specialists help scope, contain, investigate, and recover from cyber incidents while improving response processes and future defensive capabilities.
DeepSeas connects strategic advisory, offensive security, threat intelligence, managed detection and response, CyberFusion SOC capabilities, and GRC into a coordinated security program. The approach works with the tools organizations already own and supports IT, cloud, operational technology, mobile, and BYOD environments. That gives leaders clearer priorities, stronger operational context, and evidence of measurable cybersecurity progress.
Explore how integrated cybersecurity expertise helps organizations strengthen resilience, readiness, and measurable risk reduction.
"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 allows my team to deliver the compliance needed to stay up-to-date with all of our governing bodies. Furthermore, we are more confident that our staff, faculty, and students are better protected with DeepSeas as a cybersecurity partner. Without a doubt, DeepSeas is worth every dollar spent. This is our..."
"DeepSeas data security experts are top notch. They have helped us to improve our cybersecurity posture through risk assessments, penetration testing, and the development of a Data Governance Strategy. They are an invaluable partner."
"DeepSeas is a pleasure to work with. They produce consistent and outstanding results for us and our program, while being thorough, knowledgeable, and easy to work with. We have not had a finding in a certification/re-certification audit in three years across five ISO standards!"
"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 allows my team to deliver the compliance needed to stay up-to-date with all of our governing bodies. Furthermore, we are more confident that our staff, faculty, and students are better protected with DeepSeas as a cybersecurity partner. Without a doubt, DeepSeas is worth every dollar spent. This is our..."
"DeepSeas data security experts are top notch. They have helped us to improve our cybersecurity posture through risk assessments, penetration testing, and the development of a Data Governance Strategy. They are an invaluable partner."
"DeepSeas is a pleasure to work with. They produce consistent and outstanding results for us and our program, while being thorough, knowledgeable, and easy to work with. We have not had a finding in a certification/re-certification audit in three years across five ISO standards!"
"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 allows my team to deliver the compliance needed to stay up-to-date with all of our governing bodies. Furthermore, we are more confident that our staff, faculty, and students are better protected with DeepSeas as a cybersecurity partner. Without a doubt, DeepSeas is worth every dollar spent. This is our..."
"DeepSeas data security experts are top notch. They have helped us to improve our cybersecurity posture through risk assessments, penetration testing, and the development of a Data Governance Strategy. They are an invaluable partner."
"DeepSeas is a pleasure to work with. They produce consistent and outstanding results for us and our program, while being thorough, knowledgeable, and easy to work with. We have not had a finding in a certification/re-certification audit in three years across five ISO standards!"
DeepSeas combines experienced practitioners, integrated capabilities, and measurable cyber defense outcomes.
Nearly 30 years of cyber defense experience informs practical guidance and dependable security operations.
Six connected security layers help align advisory, testing, intelligence, detection, response, and compliance.
Bring-your-own-stack support helps organizations extend current SIEM, EDR, and CNAPP investments.
Documented findings and outcomes help leaders demonstrate progress to boards, auditors, insurers, and customers.
Experienced cybersecurity practitioners guide strategy, operations, risk, and resilience.
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.
Cybersecurity providers should be evaluated by the capabilities relevant to your organization, including managed detection and response, offensive testing, incident response, governance, and advisory support. DeepSeas serves organizations worldwide and provides integrated cyber defense through its MDR, offensive security, threat intelligence, GRC, and advisory services. The right provider should demonstrate clear operating processes, relevant expertise, and measurable outcomes.
Talk with DeepSeas experts about your organization’s cybersecurity priorities.
Recognized as a top 40 Managed Detection and Response provider.
Named a Leader and top-five provider in the 2024 Frost Radar Global MDR Market.
Received the 2024 Competitive Strategy Leadership Award for MDR.
Received the 2024 Global MDR Best Practices Award for Strategy.
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