I have been a Netapp and Linux trainer/consultant for more than fifteen years. I train customers, partners and Netapp engineers on a regular basis. Next to that I also train many Linux students. I am based in the Netherlands. 

Since I am also a Linux and UNIX trainer and fan, I like to work on the command-line. There is nothing wrong with GUI's or BUI's, but to my mind, the CLI gives you more direct control. So I always urge my students to not only work in a graphical interface.

Another hobby of mine is creating short video's on youtube on different topics.

I am certified in Netapp, UNIX, Linux, Nutanix, AWS.