Cybersecurity Professional

Mark Holland Jr.

Detection Engineering & Security Operations

8+ years of progressive experience spanning security operations, detection engineering, incident response, enterprise security architecture, and SIEM modernization.

Las Vegas, Nevada LinkedIn
analyst@soc:~
$ whoami
mark_holland_jr

$ cat role.txt
# GreyMatter Engineer @ ReliaQuest
# Prev: Security Architect, Detection Eng

$ cat experience.txt
8+ years

$ ls ./expertise/
detection-eng/ siem/ incident-resp/
cloud-sec/ threat-hunt/ architecture/

$ status --current
ACTIVE — open to opportunities
$
00 //

About Me

I'm a Las Vegas-based cybersecurity engineer with over 8 years of experience protecting enterprise environments — but security isn't just my job, it's how I think. I approach problems methodically, optimize systems obsessively, and never stop looking for ways to improve.

Outside the SOC, that same mindset shows up everywhere. I spend time tuning and modifying my car, chasing canyon roads through the desert, and getting out on the trails hiking. I also run a meal prep operation — because building efficient, repeatable systems is just what I do.

I believe the best security professionals are curious, disciplined, and always operating with intention. That's the standard I hold myself to.

Canyon Driving
Desert roads & car tuning
Hiking
Trails across the Southwest
Meal Prep
Systems & discipline, every week
Car Modifications
Tuning, performance & build
01 //

Experience

2025 — PRESENT
GreyMatter Engineer
ReliaQuest
  • Supporting security engineering and operational initiatives across enterprise environments
  • Investigating complex security alerts across endpoint, identity, cloud, and network telemetry
  • Delivering executive-ready dashboards, operational metrics, and strategic recommendations
  • Supporting workflow optimization and automation opportunities
  • Partnering with stakeholders to strengthen security outcomes
2023 — 2025
Security Architect
ReliaQuest
  • Led SIEM modernization and migration initiatives across enterprise environments
  • Designed security architecture and monitoring/logging strategies
  • Improved cloud visibility and drove risk reduction recommendations
  • Technologies: Splunk, QRadar, Chronicle, and enterprise cloud platforms
  • Supported operational resilience and cross-functional security planning
2022 — 2023
Threat Detection Engineer
ReliaQuest
  • Built detections across endpoint, identity, cloud, email, and network telemetry
  • Developed detections for phishing, credential compromise, brute force, privilege escalation, and lateral movement
  • Mapped detections to MITRE ATT&CK techniques
  • Tuned alerts to reduce false positives and improve signal quality
  • Improved analyst workflows and escalation quality
2017 — 2022
Senior Security Analyst → Associate Security Analyst
ReliaQuest
  • Monitored and triaged enterprise security alerts across diverse environments
  • Investigated phishing, malware, suspicious authentication, and endpoint compromise events
  • Supported escalation workflows and led incident investigations
  • Produced operational reporting, dashboards, and audit support documentation
  • Communicated findings to technical and non-technical stakeholders
02 //

Areas of Expertise

Detection Engineering
Threat Detection & Response
Security Operations (SOC)
Incident Response
SIEM Engineering & Modernization
Security Architecture
Threat Hunting
Cloud Security
Identity & Access Security
Alert Triage & Investigation
Detection Tuning & Optimization
Security Monitoring
Operational Reporting & Metrics
Security Automation Concepts
Executive Communication
Risk Reduction Strategies
03 //

Technical Skills

Security Platforms
SIEM EDR SOAR Email Security Vuln Management
SIEM & Tooling
Splunk QRadar Chronicle Microsoft Sentinel
Cloud & SaaS
AWS Azure GCP Microsoft 365
Systems & Infra
Windows Linux Active Directory
Security Domains
Detection Engineering Incident Response Threat Detection SecOps Identity Security
04 //

Certifications & Education

Certification
MITRE ATT&CK Operationalization
Certification
Purple Teaming
Certification
CIW Web Security
Education
Information Science Technology & Networking — Milwaukee Area Technical College
Education
Information Science (coursework) — University of Wisconsin–Milwaukee
05 //

Professional Philosophy

Effective cybersecurity is built on a combination of strong operational discipline, scalable engineering practices, clear communication, and continuous improvement. My approach focuses on helping organizations reduce operational risk, improve visibility, and build practical security capabilities that scale with evolving threats and business needs — with a particular interest in detection engineering, automation, AI-augmented security workflows, and modern cloud-first security strategies.

Let's Connect

Open to detection engineering, security operations engineering, incident response, and security architecture roles.

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