Pierre Mason
Arlington
Summary
Information Systems Security Officer with hands-on experience in the NIST Risk Management Framework. Specializes in leading A&A activities, developing comprehensive SSPs and POA&Ms, and conducting security assessments to achieve timely ATOs. Demonstrates strong analytical skills in evaluating security controls and ensuring compliance with federal policies.
Overview
6
6
years of professional experience
1
1
Certification
Work History
Information System Security Officer
KFORCE
Washington
12.2023 - 10.2025
- Led A&A activities for NIST High Impact systems, including development and maintenance of System Security Plans (SSP), POA&Ms, Security Assessment Reports (SAR), and supporting documentation to achieve and maintain Authority to Operate (ATO).
- Conducted formal security assessments of information systems, evaluated control effectiveness against NIST 800-53 standards, documented findings, and provided risk-based recommendations to leadership.
- Performed vulnerability scanning with ACAS/Nessus, prioritized remediation efforts, tracked progress in POA&Ms, and produced executive-level summaries.
- Created and maintained Splunk dashboards and alerts for continuous monitoring, log analysis, and incident response support.
- Hardened Windows and Linux systems using STIG benchmarks and security configuration tools, significantly reducing the attack surface.
Information System Security Officer
Leidos
Washington
07.2023 - 12.2023
- Managed RMF documentation and risk assessments for multiple federal systems, including creation of SSPs, POA&Ms, and implementation statements in Xacta to support timely ATO packages.
- Executed security control assessments using NIST 800-53 guidelines, validated technical controls on Windows and Linux platforms, and prepared evidence for annual assessments and audits.
- Conducted ACAS vulnerability scans, applied STIGs, performed system audits, and managed monthly patching cycles to maintain compliance and security posture.
- Developed and submitted monthly compliance reports for privileged users while supporting broader security management, access control, configuration management, and contingency planning activities.
ISSE
Accenture
Columbia
10.2022 - 06.2023
- Developed System Security Plans and conducted vulnerability testing using Nessus for multiple networks.
- Performed STIG compliance checks, ACAS scanning, and patching using SCCM and Linux tools while supporting RMF processes.
- Monitored systems with Splunk and ensured secure handling of sensitive media and configuration management.
ISSO
ClearWaters IT
Bethesda
11.2021 - 09.2022
- Built and maintained RMF processes, created Splunk dashboards for real-time threat monitoring, and implemented ACAS for automated vulnerability scanning.
- Managed ATO processes for multiple systems in eMASS, conducted NIST compliance assessments, and validated Windows/Linux controls against 800-53 requirements.
- Identified control gaps, recommended corrective actions, and supported continuous monitoring to strengthen overall security posture.
Sr. Service Desk Technician
GDIT
Arlington
06.2019 - 11.2021
- Provided Tier 2/3 technical support and resolved hardware/software issues while ensuring NIST 800-53 compliance during workstation upgrades and deployments.
- Managed user account provisioning/deprovisioning in Active Directory and handled IT asset inventory.
Education
Bachelor of Science - Information Technology
Western Governor’s University
Master of Science - Cybersecurity & Information Assurance
Western Governor’s University
Skills
- A&A / RMF: SSP
- SAR
- POA&M
- ATO packages
- NIST 800-37
- NIST 800-53
- Continuous monitoring
- Risk assessments
- Xacta
- EMASS
- Vulnerability Management: ACAS/Nessus
- STIGs
- SCAP
- Remediation tracking
- Splunk (SIEM & dashboards)
- STIG Viewer
- SCCM
- Incident response
- Systems hardening (Windows/Linux)
- Security control evaluation
Certification
- CASP+
- Security+
- Pentest+
- PMP
- AWS Solutions Architect
Timeline
Information System Security Officer
KFORCE
12.2023 - 10.2025
Information System Security Officer
Leidos
07.2023 - 12.2023
ISSE
Accenture
10.2022 - 06.2023
ISSO
ClearWaters IT
11.2021 - 09.2022
Sr. Service Desk Technician
GDIT
06.2019 - 11.2021
Bachelor of Science - Information Technology
Western Governor’s University
Master of Science - Cybersecurity & Information Assurance
Western Governor’s University