David O'Brien Email & Phone Number

Arlington, Va, Us

Mclean, Virginia, Us

• Created a new SOP for Active Directory Failover to our COOP site in West VA. This Covered failing over to the COOP site in case of a total loss of data in Vienna , cleaning up residual meta-data and procedures to eventually fallback to our main site in Vienna.• Came up with an updated SOP for Windows ESXi Host Deployment and Setup. This covered remotely connecting to the Dell iDrac for raid / disk configuration, installation of ESXi 6.7 and adding it to VMware vCenter 6.7

• My daily task consists of using Sentinel One and ADAudit Plus programs. With Sentinel One, newly built systems are moved to their specified management group. It can also eliminate any potential threats that arises within the console. With ADAudit Plus, I’m able to track failed logons, contact the user, and resolve their logon issues.• Monitored ProofPoint – TRAP to analyze emails that were quarantined.• I used ADManager Plus to reset user passwords if it was determined that they clicked on a malicious link in an email.• Microsoft 365 Compliance Console was used by me to located any malicious email forwarded to other employees and if they clicked on the malicious link as well.

• Performed monthly patches in four network enclaves using Ivanti / Shavlik Server. Also, troubleshooting any issues that came up with any clients where the agents weren’t reporting back to the server.• Successfully converted with minimal downtime, Windows Server 2008 R2 Active Directory Domain controller over to Windows Server 2016 Active Directory. Which included moving the FSMO Roles over to the new Windows 2016 Servers. • Install and configured SPLUNK agent on Windows 2016 Servers for communication to the Splunk monitoring console.• Installed and configured Remote Desktop Services 2016 with High Availability.• Extensive experience with Active Directory GPOs including implementing DoD created GPOs for various Windows Servers.• Worked extensively on locking down the active Production Exchange 2016 Relay Server using the latest DISA DoD STIGs.

• Performed and validated daily deployments of build artifacts to our pre-production environment.• Administer and maintain a VMware VCenter Server for our test environment.• Maintained multiple Windows Server 2012 R2 Active Directory domains in our test environment.• Used Nessus Professional 8 to identify and fix any vulnerabilities that were found in our Active Directory domains.• Used Scap Compliance Scanner to scan the Active Directory systems using the current DISA Security Technical Implementation Guidelines (STIGS) so that any finding can be mitigated and maintain compliance.• Built and administered a Microsoft Windows Server Update Services (WSUS) Server to manage the distribution of our updates and hotfixes released from Microsoft Corporation in both test environments.• Downloaded and package the monthly MS Security Updates and the quarterly Oracle patches for installation into our production servers at DISA. • Provide security updates and patch details monthly for dissemination of the Risk Analysis to the customer’s PMO.• Review and respond to weekly IAVM notices from customer and responded accordingly as to if they are applicable to our systems.

• Installed and tested monthly Microsoft updates and hotfixes to the Windows 2012 R2 servers using WSUS Server.• Performed daily checks of the Windows Servers including disk usage, event logs, anti-virus scans, backups completed, updates have been installed and checking the reliablilty monitor to view overall system stability.• Stop and start Window Server 2012 R2 instances on a weekly schedule using the Amazon EC2 console.

• Built and configured multiple virtual environments in support of DHS CDM (Continuous Diagnostic and Mitigation) Task order involving the monitoring of 44 different agencies with Cyber Security Tools• Designed, implemented and maintained Microsoft Active Directory infrastructure for aforementioned environments to include implementing GPOs to enforce controls in support of meeting FEDRAMP High/High/Moderate security posture• Contribute to teams System Security Plan and infrastructure documentation• Support project Subject Matter Experts in their tool installation, configurations and troubleshooting• Mentored junior associates on Active Directory and System Administration roles

• Manage day-to-day operational tasks, gather requirements, organize resources, determine scope and follow change request policies and procedures.• Track scheduled progress through the appropriate metrics, and revise to meet changing needs, requirements and delivery.• Support program lifecycle of projects, including customer interaction, technical delivery, status reporting, and analytical solutions.• Business relationship manager and liaison for program offices within the organization.• Tracked and maintained weekly status reports and project issues to ensure tasks are followed through to completion in a timely manner.• Train and mentor new staff members with a strong emphasis on optimizing productivity and performance as well as cultivating needed relationships with other groups to ensure smooth work progress.• Maintain up-to-date working documentation as our daily processes changed.

• Conduct weekly vulnerability scans on multiple networks using BeyondTrust:: Retina software. • Work with System Administrators to mitigate any weekly IAVA findings from the Retina scans.• Report IAVA compliance via the NRT• Responsible setting up user accounts on all networks. Including working with the Govt. people to get the users their SIPR Tokens and SIPR Enterprise email accounts setup.• Handled sanitation & recovery of classified data spillages.• Created a POA&M addressing all vulnerabilities for a classified network.• COMSEC / CRYPTO briefed.

• Administered multiple Windows SQL Server 2008 databases on multiple networks.• Worked closely with the web-team keeping their databases up to date on a weekly basis.• Replaced outdated Windows 2003 SQL Servers with Windows 2008 SQL Servers.• Worked closely with IA to keep the SQL Servers secured and patched.

Tampa, Fl, Us

• Responsible for the system/network administration of all projects associated with the O&M contract.• Was the lead Windows Engineer during a customer accreditation of one of our classified development networks. Duties included but were not limited to working with the IA Team and conducting IA Scans and Mitigations using DISA Gold Disk, WASSP, SECSCN and Retina. • Provide support for the installation of hardware of some Dell PE and Sun Systems, IBM, Hitachi and HP Blade Centers.• Built a customized / secured Windows 7 build in a large classified development network. Deployed it both locally with bootable Windows PE media and on a larger scale using Windows Deployment Services from a Windows 2008 R2 Server.• Implemented and maintained server patches (WSUS), virus definitions (Symantec End Point) & various other duties as a system administrator.• Install applications like; Red Hat Enterprise Linux 5.3/5.4, Solaris 9, Windows 2003 Server, XP, Vista & Windows 7, JAVA, and associated updates and patches.• Support the technology development through research and development initiatives; provided day-to-day technical support for the operation and maintenance team; Applied software skills to maintain databases and data ingestion processes or other System Administration functions.• Help troubleshoot and resolve any network operating system hardware/software outages/problems and get them restored with minimal downtime.

• Experience with various network security assessment tools, e.g., DISA Gold Disk, WASSP, SECSCN and Retina.• Built and secured a Linux / ESX server using SECSCN • In charge of system acquisition ranging from desktop computers to enterprise servers to meet current and future needs of the organization.• Rebuilt and maintained two SCI LANs according to DCID 6/3 at PL3 with customer applicable DOD DISCAP and DIACAP guidance.• Installed and monitored server backups using Backup Exec.• Created, installed and maintained a vast array of system images created with Symantec Ghost Solution Suite.• Secured, installed, and configured Microsoft deployment services (WDS) for Server 2003 for imaging Windows XP SP3 systems.• Installed and troubleshot Pointsec encryption on a large number of laptops in accordance to our Company Network Guidelines. • Helped administer a large company wide RSA SecurID database. This included adding users and troubleshooting any remote access problems they may have.• Responded in a timely manner to user support tickets generated by our Corporate Helpdesk for our Chantilly and Ballston offices.

• Lead System Administrator. Built and supported the main Proposal center network. Center was responsible for winning multiple government contracts; to include a recent 1.5 Billion dollar award.• Experienced in working closely with customers and Security Team in writing a new AIS security plan for a new multi-divisional proposal network and the process under which it operates.• Was awarded “Excellence in Information Technology” for my contribution in building and securing the CENTCOM Deployable Headquarters.• Designed the architecture for a large pc and server deployment center, allowing images to be distributed in a rapid, secured, and successful manner. This system was used to build a deployable headquarters for the U.S. Central Command (CENTCOM) in Tampa, FL.• Configured and tested numerous Maxtor MaxAttach (NAS 6000) Disk arrays for the CENTCOM project.• Support various large 24/7- T.S. proposal efforts, received achievement awards for outstanding support.• Sole System Administrator responsible for securing and maintaining a network of 55 users with 3 Windows NT servers (PDC, BDC and Exchange 5.5 Member Server) with 60 workstations. Migrated a Windows NT 4.0 network to a Windows 2000 network. Migration includes file and print servers, Exchange 5.5 email to Exchange 2000, all domain, workstations and users.• Backup and maintain Primary and Secondary DNS and DHCP servers, Print Server, File Servers, etc.• Maintain an unclassified and SCI LAN following standards and regulations.• Responsible for all data backups (over 100 GB), utilizing Veritas Backup software.• Analyze, troubleshoot and repair all problems within multiple (LAN/WAN) networks, T1’s, cabling, Cisco routers, switches and hubs to maximize performance. • Responsible for all installations of servers and software applications, performance tuning, storage management, and security updates

• Physically moved, setup, secured, and administered an off-site office of over 75 users to a new location. Migrating from Novell to Microsoft Windows Networking. Configured their applications and file and print services, and setup network security permissions. • Disaster Recovery skills includes recognition for designing a corporate Y2K software CD to be used on all window platforms both in-house and off-site, which ensured Y2K compliancy of key servers as well as workstations.• Maintained a corporate helpdesk of over 700 local and remote with everyday pc and networking issues.• Administered the corporate POP mail server, including adding user accounts and fixing any problems users have in getting their mail.• Instrumental in migrating users from CC: Mail to POP mail, and then to Microsoft Exchange. Also trained users on how to use the various mail clients including Eudora, Outlook and Netscape mail.• Administered two corporate Exchange servers with about 700 users. Including adding users, creating public folders and assigning rights.• Part of a team responsible for managing day to day network services for over a 1000 users including DHCP, DNS and WINS.• Implemented at different times various Citrix products running corporate financial services to our off-site offices.• Administered a CC: Mail post office for approximately 300 plus users. • Migrated corporate print services from Novell to Windows NT TCP/IP printing. • Helped remote users gain access to company resources through dial in services using Windows 9X and Windows NT• Key individual in maintaining and running the corporate Video Teleconferencing system.