Yasser Mohammed Hassanain Elsayed is a researcher, reviewer, critical care physician, and cardiologist in the Egyptian Ministry of Health. He has (86) publicized articles as a single author and (4) medical books since December 2017. He has reviewed (47) articles since November 2020. He is a Keynote Speaker in many international cardiovascular conferences. The most famous article for the researcher; 1. Graded Phenomenon (Yasser’s Phenomenon). 2. Wavy Triple An Electrocardiographic Sign (Yasser’s Sign). 3. Connected Aircraft Squadron Electrocardiographic Sign (Yasser’s sign). 4. Electrocardiographic Passing Phenomenon (Flying Phenomenon or Yasser’s Phenomenon). 5. Movable-weaning off an electrocardiographic phenomenon (changeable phenomenon or Yasser’s phenomenon). 6. Yasser’s COVID-19 Discrepancy phenomenon He is also an editorial member in several medical journals e.g. Anaesthesia & Surgery Open Access Journal, Journal of Clinical & Community Medicine, Annals of mental health and addiction sciences, Research and Reviews on Healthcare Open Access Journal, International Journal of Clinical Case Reports and Reviews, International Journal of Clinical and Medical Case Reports, Journal of MAR Cardiology, Research International Journal of Anesthesiology, etc.