Open to opportunities

Clark Havens

@clarkhavens

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Senior Systems Administrator skilled in Windows/Linux infrastructure, security, and cloud tooling.

United States

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What I'm looking for

I am seeking a security-focused infrastructure role where I can manage servers, lead remediation and compliance efforts, and collaborate cross-functionally in a reliable, mission-driven team.

I am a Senior Systems Administrator with extensive experience managing Windows and Linux server environments for large enterprise and DoD customers. I specialize in system imaging, upgrades, STIG compliance, vulnerability remediation, and certificate (PKI) management.

At Leidos I supported mission-critical programs by administering Active Directory, SCCM, WSUS, SPLUNK, MDM, and SQL databases while coordinating with network, DB, and SME teams. I led remediation efforts using ACAS/Tenable and supported Command Cyber Readiness Inspections and accreditations.

Previously I served as Division SA Lead for Vectrus/USACE, supervising SA teams, consolidating data centers via virtualization, maintaining backups and NetApp storage, and implementing policies for patching and IAVA compliance. I bring hands-on experience with VMware ESXi, PowerShell, DHCP/DNS, SCCM, and diverse backup solutions.

I hold a BS in Business Information Systems and CompTIA Security+ CE, possess an active Secret clearance, and seek to apply my technical leadership and security-focused administration to resilient, compliance-driven infrastructure roles.

Experience

Work history, roles, and key accomplishments

Systems Administrator

Leidos

Aug 2020 - Aug 2024 (4 years)

Managed and remediated over 200 physical and cloud servers across 90+ Army installations, ensured STIG/DoD compliance, and supported accreditation and Command Cyber Readiness Inspections. Administered Active Directory, PKI/SSL certificates, SCCM, WSUS, SPLUNK, and vulnerability remediation workflows to reduce risk and maintain operational availability.

Windows Server Active Directory SCCM WSUS PKI Splunk Patch Management Bitlocker

Systems Administrator

Leidos

Jul 2018 - Aug 2020 (2 years 1 month)

Maintained Windows, Solaris, and Linux servers for GCSS-AF, ensured STIG compliance, managed system patching/outages, and supported helpdesk operations to sustain program availability. Implemented performance tuning, storage allocation, and coordinated cross-team technical solutions.

Windows Server Linux Jenkins Jira SQL Virtualization Active Directory Patch Management

Senior Systems Administrator

Vectrus

Jun 2011 - Jul 2018 (7 years 1 month)

Led South Atlantic Division server administration and supervised six district SAs, consolidated data center (50% footprint reduction), and maintained IAVA compliance for 30+ local and virtual servers. Managed backups, NetApp volumes, AD/Exchange administration, and vulnerability remediation across the division.

VMware ESXi NetApp Active Directory Exchange PowerShell SCCM Backup Vulnerability Management

PC/LAN Analyst II

Wells Fargo

May 2010 - Jun 2011 (1 year 1 month)

Provided desktop/laptop/peripheral support for 300–500 users, managed patching, software deployments, backups, and lifecycle replacements, and assisted with Avaya voice system troubleshooting and off-site network installations.

Desktop Support Patch Management Avaya Backup Imaging Ticketing

Management Reporting Specialist

Wachovia Corporate Mortgage Services

Apr 2008 - May 2010 (2 years 1 month)

Managed user access and workstation lifecycle for 400+ users, maintained file/print servers and tape backups, and produced daily/weekly/monthly mortgage reports and MS Access business-unit databases for management.

Active Directory MS Access Reporting Backup Access Management Troubleshooting

Systems Support Technician

Reeds Jewelers

May 2006 - Jan 2008 (1 year 8 months)

Supported network connectivity for corporate and 89 retail locations, managed Active Directory and Exchange, maintained ten local servers, and administered PBX/phone systems and Great Plains security for 150+ local users and retail stores.

Active Directory LAN WAN Troubleshooting Great Plains