University Professor, PhD in Industrial Microbiology, with great experience and background in wide areas of microbiology, soil and environmental topics ranging from the development of biotechnological schemes to agricultural and crop production improvement through soil-plant-microbe interactions. He was the IP of numerous National, EC projects, and member of the MC of numerous EU COST Actions related to biotechnology, sustainable agriculture, organic farming, biorefinery and circular economy, and particularly fermentation processes and immobilization/encapsulation technologies, microbial mineral solubilization, bio-treatment of agro-industrial wastes, formulation of microbial (AM and PGPM) single/double inoculants, multifunctional properties of soil microorganisms, plant nutrition, and management of disturbed soils. He is the author of 160 publications; the creator of one patent; has a h factor of 42, 5415 citations and a value of i10-64; he is a member of the Editorial Boards of the Nature Scientific Reports, The Scientific World Journal, Frontiers in Plant Science and Microorganisms (MDPI). Prof. Vassilev leads the Research Group “Advanced biotechnologies applied in Biofertilizers’ research and production”, Spain. He worked as an invited Professor in Finland, Turkey, Italy, Germany, and Spain. He is amongst the World’s Top 2% Highly Cited Scientists (in the field of Biotechnology-Clarivate Ranking, University of Stanford).