Great Lakes Tech Services
Emergency IT Services

We’ll stop what we’re doing and work on your computer system problem remotely or with on-site emergency IT services and support.

On Demand IT Solutions & Microsoft Support

This is the traditional business model for IT (Information Technology) services. Call us when you need us.

managed IT Services

The goal of managed IT services is to maintain your system on a continual basis for a flat monthly fee.

Scheduled IT Support

Larger companies usually need an on-site visit once a week to address user issues, maintain hardware, etc.

Spam Filtering Service

Sick of spam in your mailbox? Or even worse… scam and phishing e-mails and virus laden junk?

VoIP – Voice over Internet Protocol – Phone Systems and Services for Businesses

Enterprise-Grade VoIP for SMBs

Other Important Pages


Photo of Mark Mullarky

I got my Associate Degree in Machine Design from Waukesha County Technical College in 1986. I am also Microsoft MCSA certified. I immediately went to work at a small manufacturer in Wales, Wisconsin. For a couple years, all my work was done with a drafting machine and a mechanical pencil. Eventually, we got a hand-me-down system from corporate, which was IBM PS2 workstations running DOS and Anvil 5000 CAD software. Eventually, we upgraded the system to Pentium 90 computers running Microstation.

Great Lakes Tech Services Partners

We're proud to work with many fine global, national and Wisconsin firms; Here's a sampling of Great Lakes Tech Services, LLC Partners: Datto, Cytracom, HP, Intel, Barracuda, Microsoft, Office 365, etc.

Service Area for IT Support, Computer Network Support Services

We provide tech support services to small and medium businesses in Southeast Wisconsin, primarily Jefferson, Waukesha, and Milwaukee Counties.

Free Technology Review

Great Lakes Tech Services, LLC founder Mark Mullarky makes time available in the first quarter of each year to do free technology reviews for small to medium sized businesses located in Milwaukee and Waukesha Counties.