Open to opportunities

Nate User

@nateuser

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Senior Information Systems Security Manager delivering ATO compliance and NIST-aligned cybersecurity leadership.

United States

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What I'm looking for

I seek a security leadership role where I can lead ATO efforts and NIST-based programs, mentor teams, contribute to policy development, and balance impactful work with teaching and growth.

I am a Senior Information Systems Security Manager with extensive experience leading cybersecurity programs, achieving ATO compliance, and implementing NIST 800-53/800-37/800-18 frameworks across laboratory and corporate environments. I have led cross-functional teams of system administrators and engineers, managed HWIL hardware and software on Linux and Windows, and conducted large-scale vulnerability scanning and compliance checks using ACAS and government tooling.

I hold a Doctorate in Information Assurance and multiple industry certifications (CEH Master, CCISO, PMP, CHFI, CompTIA Pentest+, CompTIA Linux+, MCSA, Security+) and have a strong record of delivering projects ahead of schedule while advising stakeholders on security requirements and policy development. I also teach cybersecurity and CIS courses at the collegiate level, contributing to curriculum development and student advisement.

Experience

Work history, roles, and key accomplishments

Senior Information System Security Manager

Intrepid

Feb 2024 - Nov 2024 (9 months)

Led cybersecurity operations for laboratory and corporate HQ, achieving ATO support and compliance across 96 systems while implementing NIST 800-53/800-37/800-18, JSIG, and CMMC standards.

NIST 800 53 ATO EMASS Linux Windows Systems Management Security Policies Team Leadership

Computer Information Systems Adjunct

American National University

Mar 2023 - Nov 2024 (1 year 8 months)

Instructed cybersecurity and IT courses (including graduate-level) and restructured Canvas-based courses to improve curriculum and student professional development.

Instructing Curriculum Development Network Security Ethical Hacking

Computer Information Systems Adjunct

Snead State Community and Technical College

Jan 2021 - Nov 2024 (3 years 10 months)

Taught 2–3 cybersecurity and core CIS courses per semester, established a partnership with WGU, and updated course content to reflect current industry practices.

Teaching Networking Penetration Testing CISCO Academy Instruction

Information System Security Manager

COLSA

Oct 2023 - Feb 2024 (4 months)

Provided ATO support for Army Materiel Command, managed ATO packages through eMASS, and coordinated with government ISSMs, AOs, and ISOs to advance accreditation.

ATO EMASS NIST Compliance Systems & Security Audit

Senior Cyber Security Engineer

Modern Technology Solutions Incorporated

Feb 2022 - Oct 2023 (1 year 8 months)

Supervised IA team and delivered ATO support for a government software test lab, conducting scans, preparing SSP/SCTM artifacts, and implementing mitigations across 96 systems.

ACAS Vulnerability Management SOP Development Linux Windows Team Leadership Incident Response

System Administrator / Cyber Security Admin

Penta Research

Feb 2021 - Feb 2022 (1 year)

Maintained HWIL lab operations and provided ATO support while ensuring physical security and implementing NIST and CMMC 2.0 controls.

HWIL Operations NIST CMMC Linux Windows Physical Security Compliance

System Administrator / Cyber Security Admin

Modern Technology Solutions Incorporated

Oct 2017 - Feb 2021 (3 years 4 months)

Managed lab operations and HWIL systems for 60 systems, supported ATO acquisition, and created software repositories while working with government leads.

HWIL Linux Windows ATO Acquisition System Administration Configuration Management

Software Analyst II

Torch Technologies

Oct 2016 - Oct 2017 (1 year)

Supported development and testing of Apache-based software for U.S. Government customers and advised on usability and validation efforts.

Software Testing Apache Usability Government Software Validation Documentation Collaboration

UAS Maintainer / System Administrator

U.S. Army

Oct 2010 - Oct 2016 (6 years)

Installed and supported computer and network systems for Unmanned Aircraft Systems, conducted vulnerability scans and maintenance, and maintained accountability for high-value equipment.

System Administration Equipment Maintenance Security Protocols Data Integrity Personnel Management