michaelkeenan
RÉSUMÉ
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Michael Keenan

Senior Network Security Engineer

B.S., Information & Computer Science Networking and Security, magna cum laude

I design, implement, and secure enterprise network and cloud infrastructure across healthcare, defense, and critical infrastructure. My work spans firewall architecture, SIEM operations, and Zero Trust across Palo Alto, Fortinet, Cisco, Azure, and AWS.

Portrait of Michael Keenan

14-year U.S. Air Force veteran

14+Years in security
120+Firewalls administered
11K+Security rules developed
99.99%HA uptime achieved

01 Profile

Highlights

  • 14+ years securing enterprise network and cloud infrastructure across healthcare, defense, and critical infrastructure.
  • Reduced security incidents and improved uptime while leading large-scale security deployments in regulated environments.
  • Delivered against NIST, ISO 27001, HIPAA, and PCI DSS.

Military Service

MAY 2002 - OCT 2016

14-year U.S. Air Force veteran. Held TOP SECRET clearance while securing mission-critical systems in TS/SCI environments.

02 Professional experience

Information Security Systems Engineer

Lancesoft (L3Harris) / Melbourne, FL

MAY 2025 - PRESENT

  • Validate Fortinet FortiGate security designs and configurations across 14 sites for an Australian Defence Force and airport cybersecurity infrastructure upgrade.
  • Review 2,000+ pages of CDD/SDD documentation for compliance before third-party implementation.
  • Validate Splunk SIEM, Cisco Threat Grid, and Imprivata PAM designs against security requirements.
  • Use in-house AI compliance tools to improve documentation validation and implementation accuracy.
  • Support R&D on an in-house security posture and NOC alerting system.

Senior Network Security Engineer

LifePoint Health / Nashville, TN

OCT 2021 - MAY 2025

  • Administered 120+ Palo Alto devices plus Cisco ASA, Fortinet FortiGate, Panorama, and FireMon across distributed data centers.
  • Engineered high-availability FortiGate solutions that achieved 99.99% uptime and removed single points of failure.
  • Developed 11,000+ security rule sets across routers, switches, load balancers, and network management platforms.
  • Resolved 300+ security incidents with segmentation, ACLs, and IPS, reducing incident rates by 20%.
  • Led Azure security architecture and Zero Trust controls aligned with NIST SP 800-207.
  • Integrated Kindred and LifePoint networks after acquisition using site-to-site VPNs and secure IP routing.

Network Security Engineer

Integrated Resources Inc. / Tampa, FL

JUL 2020 - OCT 2021

  • Engineered segmentation and Cisco ISE Network Access Control with Check Point firewalls for the Emera Cyber Security Framework.
  • Audited DNS and firewall configurations against the framework and optimized policy compliance.
  • Modernized 25+ switches at the Eastern Operations Center and supported routers at 20+ substations.

Cybersecurity Engineer

Ashley Furniture Industries / Tampa, FL

NOV 2019 - JUL 2020

  • Tuned Darktrace IDS across 1,000+ endpoints, cutting false positives by 45%.
  • Deployed MFA for Azure applications and Palo Alto GlobalProtect VPN to 2,000+ users.
  • Designed Syslog-NG to Microsoft Sentinel log management and configured Palo Alto ACLs and URL filtering.
  • Implemented least-privilege IAM and secured operational technology integrations.

Network Security Engineer

ReliaQuest / Tampa, FL

JUL 2016 - NOV 2019

  • Scoped NGFW refresh projects for clients including IHG, Domino's, and SeaWorld, influencing $2M+ in security investments.
  • Led IPsec VPN redundancy for 150+ clients and rebuilt SolarWinds monitoring for mission-critical networks.
  • Deployed Cisco FirePOWER, Palo Alto, and FortiGate NGFW platforms across client environments.
  • Engineered SIEM deployments using LogRhythm, ArcSight, and IBM QRadar with multiple threat-intelligence sources.
  • Designed security architectures, policies, standards, and roadmaps; coached new hires after promotion.

Network Engineer / Little Rock, AR

Arkansas Blue Cross Blue Shield / Little Rock, AR

MAY 2014 - JUL 2016

  • Managed enterprise firewalls, IPS, anti-malware, and network security systems.
  • Deployed IBM QRadar with 50+ log sources and tuned correlation rules.
  • Deployed SSL/TLS VPN with MFA for 500+ users and administered 50+ PKI certificates.
  • Implemented Blue Coat SSL inspection and identity-based policy; mapped network paths for operations.

Cyber Systems Operations

Arkansas Air National Guard / Ft. Smith, AR

MAY 2012 - OCT 2016

  • Supervised a 4+ member team in a TS/SCI facility, overseeing tickets, rollouts, and enhancement projects.
  • Managed accounts, access, and patching for 150+ systems and supported secure intelligence operations.
  • Delivered TCP/IP and security training and executed uptime remediation plans.

Crew Chief (Aerospace Maintenance)

U.S. Air Force / Various Locations

JUN 2002 - MAY 2012

  • Supervised airmen as a non-commissioned officer (NCO), maintaining mission-critical aircraft and equipment valued up to $288M.
  • Helped establish the first joint Active Duty/Guard unit for eight aircraft valued at $1.6B.
  • Partnered with Lockheed Martin to integrate 177 maintenance laptops for flight-line technical data.

03 Technical expertise

  • Firewalls & network security

    Palo Alto (Panorama), Fortinet FortiGate, Cisco ASA / FirePOWER / FTD, Check Point, F5 ASM / LTM, NetScaler, Blue Coat, FireMon

  • SIEM & monitoring

    Splunk, IBM QRadar, ArcSight, LogRhythm, Microsoft Sentinel, Syslog-NG, Darktrace, Cisco Threat Grid

  • Identity & access

    Cisco ISE, TACACS+, Active Directory, Imprivata PAM, MFA, PKI, SSL/TLS

  • Cloud & infrastructure

    Microsoft Azure, AWS, VMware vSphere / ESXi, Cisco Nexus / IOS, SolarWinds, DNS, TCP/IP

  • Frameworks & practices

    Zero Trust (NIST SP 800-207), NIST 800, ISO 27001, HIPAA, DevSecOps, third-party risk

04 Education

05 Certifications

  1. Certified Information Systems Security Professional (CISSP)

    ISC2

    Apr 2017 - Apr 2023

  2. GIAC Security Essentials Certification (GSEC)

    GIAC Certifications

    Nov 2017 - Nov 2021

  3. Cisco Certified Network Associate (CCNA)

    Cisco

    Jul 2019 - Jan 2023

  4. Microsoft Azure Fundamentals

    Microsoft

    Apr 2022

06 My YouTube channel

Knowledge sharing / since 2018

Watch on YouTube

Founder and content creator at Michael Keenan LLC, publishing security tutorials on YouTube.