In charge of training assistants in Aesthetic Surgery at the CHU of Brussels for six years, Doctor Zirak is considered an aesthete in the field of injectables.

Indeed, he is the originator of the "NIH" concept: "Natural, Imperceptible and Harmonious".

"This triptych represents the cornerstone of the work of any Aesthetic Surgeon," he already said in April 2010 during a seminar on Aesthetic Medicine and Surgery held at CHU Brugmann.