Corey Greenwalt
Littleton,CO
Summary
Experienced Systems Administrator with over 10 years of success supporting diverse IT environments across finance, legal, medical, manufacturing, nonprofit, and sales industries. Skilled in infrastructure management, cloud services, network administration, escalated technical support, and project execution. Background includes leadership of service delivery efforts, cross-team collaboration, and high-volume support environments from both MSP and military contexts.
Overview
14
14
years of professional experience
Work History
Systems Administrator
Integris
05.2022 - Current
- Supported and managed IT operations for over 250 SMB clients across multiple industries.
- Oversaw network administration, system setup, troubleshooting, and escalation handling.
- Acted as escalation point for critical tickets and supported process improvement initiatives.
- Coordinated with internal teams and leadership to ensure proactive service delivery.
- Assisted with license management, system security improvements, and disaster recovery planning.
- Provided client-facing support for cloud migrations and security posture enhancements.
IT Technical Support Specialist
New Health Services
01.2022 - 03.2022
- Delivered Tier 1 support across diverse hardware, software, and network environments.
- Handled system onboarding, hardware deployment, and user training for non-technical users.
- Managed ticket escalations and documentation for internal tracking.
- Resolved diverse range of technical issues across multiple systems and applications for customers and end-users across various locations
Signal Support Systems Specialist
United States Army
11.2011 - 11.2015
- Served as COMSEC Custodian, responsible for the secure handling, inventory, and accountability of cryptographic materials and devices.
- Implemented and enforced communication security protocols in compliance with Army regulations.
- Trained personnel on COMSEC procedures and ensured operational readiness of secure communication equipment.
- Designed and maintained company SharePoint environments.
- Managed critical IT equipment valued over $1 million with 100% accountability.
- Led troubleshooting and repair efforts for secure communication systems.
- Developed clear technical communication strategies for non-technical end-users.
- Managed critical IT equipment valued over $1 million with 100% accountability.
- Led troubleshooting and repair efforts for secure communication systems.
- Developed clear technical communication strategies for non-technical end-users.
Education
Associate of Applied Science - Computer And Information Sciences
Arapahoe Community College
Littleton, CO08.2020
Skills
- Microsoft 365 & Azure AD Administration
- Google Workspace Administration
- Windows Server, Active Directory, VMware, ESXi
- Network Administration and Troubleshooting
- Endpoint Security & Device Management
- Strong Communication & Stakeholder Engagement
- Project Coordination & KPI Tracking
- Advanced Excel & Google Sheets Automation
- Ticketing Systems (ConnectWise Manage, Automate)
Timeline
Systems Administrator
Integris
05.2022 - Current
IT Technical Support Specialist
New Health Services
01.2022 - 03.2022
Signal Support Systems Specialist
United States Army
11.2011 - 11.2015
Associate of Applied Science - Computer And Information Sciences
Arapahoe Community College
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