In the period 1975-1980 N.A. Enaki (Enachi) becomes a student of the Physics Faculty, Moldava State University (Chisinau, Moldova Republic). His scientific works in this period contain some investigations of the electronic and optical properties of super-lattice in the presence of a quantified magnetic field. From 1981 to 1985 he becomes a post-graduate student of the radio-physics department, Physics Faculty of Lomonosov State University from Moscow. Here he was focused on the subject of PhD dissertation Quantum Statistics of super-radiance in an extended system of radiators (1985). After that N. A. Enaki continues the studies of the quantum statistical properties of radiation in Single- and two-photon cooperative processes in optics in his Dr. Habilitatus dissertation, 1993. Scientific advisor of Quantum Optics and Kinetic Process Lab in Institute of Applied Physics, Chisinau, R. Moldova. As a Principal Researcher of the Institute of Atomic Physics, Theoretical Physics Lab. Magurele, Bucharest Romania (1995-1998) he extended the area of interests in the cooperative phenomena of condensed matter and quantum nucleons. The principal investigations of N. Enaki were focused on the cooperative two-photon emission and absorption, nonlinear phase transitions in superconductivity, and Bose-Einstein condensate. Recently N. Enaki is focused on the application of nonlinear cooperative effects in microbiology. As a professor in physics, his lessons are reflected in the monograph Nonlinear Cooperative effects in open quantum systems: entanglement and second-order coherence, published in Nova Science Publishers, NY, USA, 2015, 325 pp, which of course reflects his research Interests. At this moment he was director or co-director of two international grants: NATO SPS and STCU.