In 2007, L. A. Orbeli would have been 125. He was distinguished by extremely wide scientific interrests; he created one of the most numerous and fruitful scientific schools. He authored prominent achievements in physiology of autonomic nervous system, evolutionary physiology, sensory physiology, renal physiology, physiology of underwater labor. Orbeli paid much attention to the scientific-organizational activity, he was academician-secretary of the Division of Biological Sciences of the USSR Academy of Sciences, President of the Society of Physiologists, Biochemists and Pharmacologists, Editor-in-Chief of the USSR Physiological Journal, etc. Principles of the scientific scholl founded by Orbeli are service to science and society, propity to scientific ethics, humanity.