Doctor of medical sciences, a doctor by profession and vocation. He leads Dr Mastej Health Center in Jaslo and he is a substantive expert of “Hipoalergiczni” magazine. He promotes healthy food. His medical areas of interest include the impact of diet and environment on the functioning of the body, chronobiology, pharmacology, lipidology, immunology and allergy. Without him, Hipoalergiczni magazine and Happy Evolution movement would not be of much value!