Michael Boelen specializes in the field of Linux/Unix security. In the last years, he worked as a consultant for several big companies, including T-Systems, Philips, and ASML. In 2013, he founded security firm CISOfy, to support companies with their auditing, hardening and compliance needs. Michael is the author of several open source security tools, like Rootkit Hunter and Lynis. Both are very popular and used in the toolkit of many system administrators and security professionals. Other work includes supporting the CIS benchmarks, writing articles and creating a LPIC 301 study guide. He is also a regular contributor to the Linux Audit blog, covering Linux/Unix security.