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Work Background
One Call Concepts, Inc.Senior Linux and Infrastructure Engineer
May. 2022 - Mar. 2025United StatesSenior Linux sysadmin, and infrastructure engineer, responsible for the servers and desktops, used for 811 (call before you dig) dispatching for 17 states. Responsible for OS and application patching, OS upgrades, physical upgrades, UPS and PDU security and upgrades, and shared responsibility for firewalls and other networking gear. LDAP and Nagios/Icinga monitoring. Developed an automated process to update workstations and servers from Ubuntu 16 or 18, to Ubuntu 24. Visited many remote sites to do site upgrades of server and power systems hardware, and to document the configurations of the sites.
Senior linux adminSenior Linix/Unix admin
Jan. 2021 - May. 2022Remote
Kivu ConsultingDisaster Recovery Consultant
Nov. 2020 - Dec. 2020Madison, Wisconsin, United StatesDisaster recovery, forensics, and remediation. I was working at a the site of a large telecom company who experienced a significant security breach. Technologies include Windows Server, Windows workstations, and tools such as Kect, Kace SDA, Gandalf Win 10 PE environment, and VMware. We collected the forensics, deployed a new OS with Kace SDA over PXE, and protected the rebuilt systems with the SentinelOne endpoint agent.
GE HealthcareSenior Software Engineer
Jan. 2020 - Sep. 2020Waukesha, Wisconsin, USResponsible for the build and deployment of the Operating System Linux images, for the GE Healthcare Scanner desktop product lines, meeting regulatory, security, and technological needs. This includes customization, vulnerability patching, and operational stability fixes. Replaced a manual, slow, and error prone OS image creation process with a series of 4 scripts. Reduced OS build time from days, to less than 15 minutes. Led and participated in a major migration from SLES12 to SLES15. An upgrade in a medical product line requires significant work to meet regulatory requirements, implement strong security, and not disrupt operations. Led security, technical, design, and code reviews. Responsible for customizing installations, adding packages, incorporating patching, and creating installation images and media. Created and documented the build environment for HELiOS 7, based on the best practices from FermiLab/Scientific Linux. HELiOS 7 is a rebuild of RHEL7.
GE HealthcareLead Linux Engineer
Jan. 2016 - Jan. 2020Waukesha, Wisconsin, United StatesBringing advanced technology to a medical imaging scanner near you. I worked on product research and development, emphasizing on adapting RHEL7 / Scientific Linux into the GE HELiOS distro, used for the host computers for our medical imaging products. Our team customizes this Linux distro, adds GE-specific packages, and distributes it to various business units for use in medical scanners (X-Ray, MRI, Nuclear Imaging, etc.) - Created and documented the build environment for HELiOS 7, based on the best practices from FermiLab/Scientific Linux. The process will eventually be fully automated, so when a new build is needed, the process will create a build VM, populate it with the appropriate prerequisites, create the build, package it into the various .iso files needed, and deploy those to the test lab to automatically begin stress/reliability testing on the test systems. - Close working relationship with the Scientific Linux team at FermiLab - I have presented a technical paper to the Linux admins and scientists group at Fermi, and collaborated with their Linux team to share best practices, and common challenges. - Documenting existing and new processes, to insure consistency and to preserve knowledge. - Troubleshoot and implement fixes for a variety of tools, packages, or product implementations - Primary point of contact for the X-ray/Mammography engineering organization. Provided fault analysis, design reviews and recommendations, and on-site travel to Buc, France. for a hands-on workout session to improve system performance and reliability.
Hewlett Packard EnterpriseTeam lead for Linux Operations Support Team: Re-design of healthcare.gov Linux server environment
Sep. 2013 - Jan. 2016Telecommute / Southeast Wisconsin / Washington DCTeam lead of the group of experienced Linux sysadmins responsible for the build and operations of the servers to fix the Obamacare server environment (healthcare.gov). I was called into a highly visible situation; defined the requirements, interviewed, hired, and led the team. We managed ~2700 servers running RHEL 6, mostly on VMWare, some high end servers were bare metal. Extensive use of automation as we developed the processes. Defined and automated the build process using VMWare Orchestrator. We went from a manual checklist, to an automated process that could build 200 Virtual Machines in an hour. Ran meetings with my team, as well as technical and security design reviews with the application teams and government officials. Frequent travel to Washington DC for face to face meetings, occasional travel to HP sites for planning meetings or datacenter operations. Responsible for my team’s InfoSec findings and remediations. Executed DISA STIG, Retina, and Nessus scans on a regular basis.
Hewlett Packard EnterpriseL3 Linux Systems Administrator
Aug. 2013 - Sep. 2013Working to create a brand new environment to fix the rollout of a troubled project (the Obamacare website, healthcare.gov), gathering requirements and defining the needs and solutions for the Linux environment.
GE HealthcareAmericas L3 Unix/Linux Operations Team Leader
Feb. 2007 - Aug. 2013Greater Milwaukee AreaTeam lead of a group of advanced Unix and Linux Systems Administrators. My team was responsible for the daily run operations of over 4150 Solaris, HP-UX, and Linux servers, supporting critical business and development applications within GE Healthcare. Team leadership involves management of assigned tasks and projects, facilitating weekly and special meetings, technical escalations, customer liaison activities, on-call schedule ownership, interviewing, and performance reviews. Also responsible for SLA and compliance reporting and metrics. ITIL V3 Foundation Certified.
GE HealthcareLevel 3 Unix/Linux Sysadmin - Run Team
Sep. 2006 - Feb. 2007Level 3 Unix Systems Administrator working at GE Healthcare in Wauwatosa, Wisconsin. Responsible for daily care and feeding of an 800 server environment which is primarily Sun hardware, ranging from 10 year old equipment to the newest 4-node cluster of E25K's running Solaris 10 and Veritas Cluster.
eFundsLead Unix Sysadmin
Jan. 2006 - Sep. 2006Senior level Unix sysadmin, responsible for final design and implementation of a large multi-node environment with strong encryption, for a government agency. The team I was a member of was responsible for 500+ Unix servers, including Solaris, HP-UX, AIX, and several flavors of Linux. Server installations/builds/and maintenance with rotating on-call responsibilities.
MGICUnix Systems Architect
Apr. 2002 - Jan. 2006Identify, design, and implement unix-based solutions in a fast-paced, challenging environment. eMagic was growing double-digits per month during some of the time I was there, which brings challenges of growth, fault tolerance, capacity, and customer service to the forefront. Was able to implement creative and effective solutions to both improve the customer experience, and to improve reliability and performance of our internet-facing financial applications. Introduced Apache and Postfix into the environment where appropriate. OS's included Solaris 6 through Solaris 9, RedHat Linux, and VMWare / ESX.
General Electric Medical SystemsUnix Systems Administrator
Jun. 1993 - Apr. 2002Member of the Unix sysadmin team for global IT organization, and for MRI Engineering. Responsible for ~40 servers and ~200 Unix desktops. Server and desktop builds, end user support, printer repairs, backup scheduling and tape handling, system and network moves & adds, server and desktop hardware, OS, and apps support. Systems included SunOS 3.5 through 4.1.4, Solaris (2.3 through 2.7), IRIX 5.x and 6.x, and Linux (various).
General Electric Medical SystemsAdvanced electronics technician
Sep. 1990 - Jun. 1993System, board, and component-level troubleshooting of diagnostic medical imaging equipment in a factory and field setting. Responsible for training of coworkers and assemblers, writing documentation, system integration and testing, and providing feedback to engineering for changes and enhancements to the product, both mechanical and software. Sent to field sites as factory representative to install new and prototype scanners in hospital and clinical environments.
Aurora Health CareBiomedical Electronics Technician
May. 1988 - Aug. 1990Responsible for repair, maintenance, and troubleshooting of biomedical equipment in a hospital setting. Equipment repaired included life support and cardiac monitoring equipment, such as respirators, ventilators, ICU monitoring, telemetry systems, and cardiac cath lab equipment. Troubleshooting and repair to the component level of both electronic and mechanical equipment.
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