Garn spent about 20 years in the classroom -- in-person and virtual -- delivering technical training on Windows Server, Linux, security and CompTIA products. He also spent time as a network administrator for U.S. Figure Skating. In recent years, he left the training industry and now provides freelance writing and editing services for companies.
Garn has written four official courseware titles for CompTIA -- Linux+, Cloud Essentials+, Cloud+ and Server+ -- and is slated to write the new Linux+ content.