Richard Blum, CompTIA Linux+ ce, CompTIA Security+ ce, LPIC-1, has also worked in the IT industry for more than 35 years as both a system and network administrator, and he has published numerous Linux and open source books. Rich is an online instructor for Linux and web programming courses that are used by colleges and universities across the United States. When he is not being a computer nerd, Rich enjoys spending time with his wife Barbara and his two daughters, Katie and Jessica.

Christine Bresnahan, CompTIA Linux+, LPIC-1, started working with computers more than 35 years ago in the IT industry as a system administrator. Christine is an adjunct professor at Ivy Tech Community College, where she teaches Linux certification and Python programming classes. She also writes books and produces instructional resources for the classroom.